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【单选题】

—Robert is indeed a wise man.
—Oh, yes. How often I have regretted his advice!
[ ]

A.
to take
B.
taking
C.
not to take
D.
not taking
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参考答案:
参考解析:
.
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举一反三

【单选题】—Mom, I did not pass the exam.—What a pity! Youit.

A.
can pass
B.
should have passed
C.
must pass
D.
must have passed