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【单选题】

You should set some rules first ____.

A.
if you want to share an apartment with your friend next semester
B.
if you wanted to share an apartment with your friend next semester
C.
if you would have shared an apartment with your friend next semester
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参考解析:
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举一反三

【单选题】If you looked at people when they spoke to you, ____.

A.
they would know when you are paying attention
B.
they will know when you are paying attention
C.
they didn't have to ask you to pay attention