为什么选C不选A呢 请帮忙解释一下 好吗?The policeman happened the traffic when the accident happened. 〔A〕 to direct 〔B〕 directing 〔C〕 to be directing 〔D〕 to have directed

请量详解.为什么不选A而是C呢? 为什么选C不选A呢 请帮忙解释一下 好吗?The policeman happened the traffic when the accident happened. 〔A〕 to direct 〔B〕 directing 〔C〕 to be directing 〔D〕 to have directed 如图,解释一下为什么选C不选A 详细解释一下,为什么选A不选C? 解释一下为什么不选A或B或C Satistics___that approximately 40 percent of all marriages in the United States end in divorce.A.show B.shows C.has shown D.are shown这个地方为什么选A呢．请帮忙解释一下. 请解释一下为什么不选D 请帮我解释一下为什么选a Suzhou is ___most beautiful tourist city and I believe I'll come for ___second time.A:the ,a B:a,a C:the,the D:a,the那位高手帮忙解释一下为什么选B不选其他的呢?不是最高级么?第二个空为什么填a呢? what is the best way_____solving the problem the problem? A to B of C in D on 选哪个?请帮忙,并解释一下为什么,谢谢 His politics ___a matter of great concern to his friends.A.was B.is c.were D.being这里为什么选C呢．请解释一下. 为什么不选A或C呢. ___the time goes by, the young trees grow stronger.A.As B With C By D For答案选A,为什么不选B?请解释一下,谢谢! There are many trees on____sides of the street ,and ___of the trees is still increasing year by year.A: both,the numberB: either, the number C: both,a number D: either, a number为什么选A不选其他的呢?拜托给位高手帮忙解释一下,谢 回答好会加分! ①生物学中组织、器官、个体怎么去分辨? ②再请帮忙解释一下： 下列属于植物器官的是：（答案选D,解释下为什么,其它有属于什么,又为什么?） A、洋葱表皮 B、松树 C、叶肉 解释一下为什么选A -Where has John gone?-To the library.He____there for an hour.A.has goneB.has beenC.went请帮忙解释一下为什么不选A而选B,has been to不是说“已经回来了”吗? 答案选C求大神帮忙解释一下