单项选择题

—() may I () the book
—For three weeks.

A. How often, borrow
B. How often, keep
C. How long, borrow
D. How long, keep

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单项选择题
It is necessary that he().

A. gives up trying
B. give up trying
C. would give up trying
D. is going to give up trying
单项选择题
Now that you have a job, you must exert (尽力) yourself in () you do at work.

A. however
B. no matter what
C. no matter how
D. whatever
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