You’d better put on a heavy coat.Sometimes it________be very cold here at night.
A．shouldB．can
C．willD．must
B

考查情態(tài)動詞的用法。句意為：你最好穿上大衣。在這里晚上有時很冷。這里can表示客觀可能性，意思是“可以，可能”。
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