難度：★ 考點：狀語從句引導詞的用法
1.The bus driver always says to us ,"Don't get off________ the bus stops."
A. when B. while C .until D. if
2. - Excuse me, can I interview Mr. Miller this afternoon?
-- A moment, please. Let me check .
A. if Mr. Miller will be free B. when will Mr. Miller have time
C. if Mr. Miller had an appointment D. when does Mr. Miller come back
3. he has little knowledge, the old worker has a lot of experience.
A. Although. B. Because. C. If
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