题目内容

____ you really need it, it is better not to use free Wi-Fi.

A. Because
B. Since
C. Unless
D. When

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—How did you survive the fire？ —The firefighters ____my screams, as I felt myself being pulled out of the house.

A. could have heard
B. might have heard
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D. should have heard

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A. or
B. and
C. Either
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A. had known
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Asked
B. Having asked
C. Being asked
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