单项选择题

Mary （） my letter, otherwise she would have replied before now.

A. has received
B. couldn’t have received
C. ought to have received
D. shouldn’t have received

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单项选择题
Five minutes earlier, （） we could have caught the last train.

A. and
B. but
C. or
D. so
单项选择题
That （） out to me at the very beginning.

A. ought to be pointed
B. ought to point
C. ought to have been pointed
D. ought to have pointed
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