【题目】We must ________ in the library. （ ）
A. be quietly
B. quiet
C. keep quiet
D. keep quietly
【答案】C
【解析】
句意：我们必须在图书馆……。根据选项知是保持安静keep/be quiet，must是情态动词，后跟动词原形，故答案为C。
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