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    21、

    I was out of town at the time, so I don’t know exactly how it _______.    

    A. was happening        B. happened       C. happens         D. has happened    

    21、C

    解析：考查代词及其含义，由语意：他们必须面临的其中一个问题就是公共卫生问题，只有that,可以代替the problem.

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