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题目内容
（国家开放大学管理英语3）
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
选择一项：
A.
have to
B.
dared
C.
may
参考答案
