A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning. 选择一项： A. have to B. dared C. may

A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
选择一项：

A.
have to

B.
dared

C.
may

出自：国家开放大学管理英语3

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