Vacation requests must ______ in writing within a two-week notice.

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问题 Vacation requests must ______ in writing within a two-week notice.

选项 A、make
B、to be made
C、be made
D、making

答案C

解析语法题。情态动词后面接动词原形，且主语与“make”是被动关系，故选C。

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