Limits have been set for the number of fish to be caught at one time.为什么是to be caught? 要用不定式?

Limits have been set for the number of fish to be caught at one time.为什么是to be caught? 要用不定式? set.off limits 英语翻译Science may set limits to knowledge,but should not set limits to imagination.--Bertrand Russell How long money have you been set aside? So far many man-made satellites_____into space. A.have been set up B.are being set upC.have set upD.have bing set up Great chances _______in the city ,and a lot of factories_______.A.have been take place;havebeen set upB.have take pleace;have been set upC.are taken place;are set upD.were taken place;were set up A great number of tall buildings ____in Beijing in the past few years.A have set up B has set up C have been set up D has been set up 几道英语时态题1.Great changes_____in the city ,and a lot of factories______.A.have been taken place have been set upB.have taken place have been set upC.have taken place have set upD.have taken place were set up2.I_____for the jewelry shop,for 帮忙分析一下句子的主谓关系和动宾关系,Great changes _____in the city,and a lot of factories___.A.have been taken place:have been set upB.have taken place:have been set up C.have taken place:have set upD.were taken place:were set up 28.Great changes ___ in the city,and a lot of factories ___.A .have been taken place; have been set upB .have taken place; have been set upC .have taken place; have set upD .were taken place; were set up 18.Great changes ___ (take place),and a lot of factories have been set up. IAR 中出现 one or more breakpoints coule not be set and have been disabled Your system clock appeards to have been set back运行,红警出现这样的,提示, Great changes _____in the city and a lot of buildings ____in the past ten yearsA.have taken place ;have been set upB.have been taken place ;have been set up C.were taken place ;were set upD.have taken place ; set up 高中英语单选,这个要用现在完成时么?Soon after the air crash,a three-party group______to investigate the cause of the accident.A.have been set up B.was set up C.set up D.have set up ABAQUS中出现如下错误,一般是由于什么原因造成的!Node set assembly__pickedset26 has not been definedUnable to locate node set assembly__pickedset26. The node set must have been previously defined. Great changes___in the city,and a lot of factories have been set up.是填has been happened还是have happened?为什么? A lot of high buildings ( ) in his hometown in the last three years是have been set up还是were set up