单项选择题

We ______ last night, but we went to the concert instead.

A. must have studied
B. might study
C. should have studied
D. would study
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单项选择题
It’s difficult to reach an agreement on a peaceful solution to this ______.
A. concept
B. connection
C. conflict
D. conclusion
单项选择题
______ they have finished the task, let the children have a rest and play for a moment.
A. For
B. Now that
C. Ever since
D. By now
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