题目内容

The old man turned on the radio ______ listened to it.

A. [A] but
B. [B] and
C. [C] or

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—How ______ do you write to your mother —Twice a month.

A. [A] much
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下列化合物在水溶液中，碱性最弱的是（）。

A. N(C2H5)3
B. NH(C2H5)2
C. NH3
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I'm sure he'll do all he can ______.

A. [A] for help
B. [B] to help
C. [C] for helping

—Did you remember ______ Ann —Oh no, I completely forgot.

A. [A] to phone
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