单项选择题

Five minutes earlier, （） we could have caught the last train.

A. and
B. but
C. or
D. so

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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
单项选择题
We can’t expect （） the habits of a lifetime in a short time.

A. for one to change
B. one change
C. one to change
D. one to be changed
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