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从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
例：We ______ last night, but we went to the concert instead.
A．must have studied B．might study
C．should have studied D．would study
答案是C。
例：We ______ last night, but we went to the concert instead.
A．must have studied B．might study
C．should have studied D．would study
答案是C。
