［答案］ D.
［析］ or这里应译为：否则。
3 I'll give the book to him ＿＿＿ he comes back.
A. since B. as soon as
C. before D. until
［答案］ B.
［析］ as soon as 引出的时间状语从句应用一般现在时表示将来要发生的动作。
4 Don't cross the road ＿＿＿ the light turns green.
A. when B. while
C. until D. as
［答案］ C.
［析］ until应译为"直到……才"，因为前面的祈使句为否定句。又如：She did not go to bed until her mother came back. 应译为"直到她妈妈回来她才睡觉"。
5 Miss Gao has been a teacher ＿＿＿ 1990.
A. before B. after
C. since D. in
［答案］ C.
［析］ 因为主句为完成时，所以应用 since表示该动作的启始点。
6 - Which would you like better, tea ＿＿＿ milk?
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