单项选择题

（）, I should not have wasted my time trying to explain matters to you.

A. I had not realized what you intended
B. Had I not realized what you intended
C. I had realized what you intended
D. Had I realized what you intended

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单项选择题

That job is quite difficult. I can understand why you have（）so many problems.

A. run for
B. run over
C. run off
D. run into

单项选择题

He will get everything ready （）three days.

A. after
B. for
C. in
D. since