我告诉他，他才知道的。

活学巧用

2.1)单项填空

（1）It was not until _________ that _________ to prepare his lessons.

A.did his father come in ;the boy began

B.his father came in; the boy began

C.did his father come in ;did the boy began

D.his father came in; did the boy begin

提示:这是not... until 的强调句式。

答案:D

（2）_________ he met with the difficulty did he realize the importance of our help.

A.Even though B.Never until

C.Only before D.Ever since

提示:本题考查倒装句用法。四个选项中只有never until 和only before 能用倒装句，而only before 和句子的意思不相符。

答案:B

2）汉译英

（1）他们一直工作到天完全暗下来。

___________________________

答案：They kept on working until it became completely dark.