选择题：(麻烦给出原因和答案）
1、It was ____she was about to leave for work___the telephone rang.
A、when;that B、as;that C、before;then D.when;before
2.Only by shouting at the top of her voice____
A.she was able to make herself hear
B.she was able to make herself heard
C.was she able to make hersele hear
D.was she able to make hersele heard
3.They were careful to seat important guests ___the host so he could talk to them easily
A.near to B.near C.next D.nearly
4.The sun is bigger than the moon,___we all know it.
A.and B.as C.which D.that
