单项选择题

If I had remembered the window, the thief would not have got in.

A) to close
B) closing
C) to have closed
D) having closed
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单项选择题
If I ______ harder for the final exam, I should have passed it. A) study B) had studied C) studied D) was studying
单项选择题
This certificate will prove______to you in your applying for a good job.
A) being of some use
B) be of some use
C) to be of some use
D) of some use
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