单项选择题

Why haven't you taken the medicine It ______ before dinner
A) should have been taken C) is taken
B) has been taken D) should have taken
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单项选择题
You many keep the car ______ you need it.
A. as far as
B. as good as
C. as long as
D. as well as
单项选择题
Before we moved to America, we ______ in Australia for ten years.
A. lived
B. living
C. had lived

D. have lived
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