Was it bill,who is one of your best friends,that played the piano for the new year concert?第二个逗号后为什么不用which而用that?

how ( ) your birthday party ,bill?it was very ( how ( ) your birthday party ,bill?it was very ( ) A is relaxing B was relaxing C is relaxed D was relaxed B:Hello,this is Bill s( ).Who is that?A:It's Ann h(). it was mike and bill who helped me with my english 为什么用was而不用were? Who is ( )(Ben and Bill)math teacher Was it Bill Gates,who made contributions to the software,____donated much money to the poor?AwhomBthatCwhichDwhat it's 8:00 o'clock bill is s in bedit's 8:00 o'clock bill is -- s--- in bed填空s什么 Was it bill,who is one of your best friends,that played the piano for the new year concert?第二个逗号后为什么不用which而用that? 强调句it is（was) .that/who,其中it is（was)能不能写成it's/it was不能缩写么? It is(was) +强调部分+that (who)+从句 Bill,is this_____bike? Yes,it is. it is Mary ( )my real friend.A.is B.that was C.who is D.who was Who is this?同义句 Who is ____ It is one o five.It is____ ____ ____. 强调句和状语从句怎么区分1.was ()Bill ,() played basketball very well, ()helped you repair your bike?A.that that whob. it that that'c. it who thatd. this who who 英语语法,1)--Who is singing in the hall?--___is william.___is known to us all that it is he who sings that way.A.it it b it as c he it d he as2) ____ was 11 o'clock____i finally finished grading the test papers.a it that b it when c that when d t 冀教版英语五年级上册阳光作业第十九课最后一题(B)怎么做(B)Ann:Hello,354789.Bill:Hello.This is Bill.Who's that,please?Ann:It's Ann,Ann Smith.Bill:Is your father at home?Ann:No,he's at school.Bill:Who's at home now?Ann:My brother it was 8 o who is it it was mary who was chosen 翻译