单项选择题

I’m sorry to have ()you waiting for a long time.

A. kept
B. made
C. got
D. let

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单项选择题

A.not only
B.all
C.both
D.only

单项选择题

() I should fail again, I will not give up the experiment.

A. Even so
B. Although
C. Even if
D. Though

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