单项选择题

John's success has nothing to do with good luck. It is years of hard work（）has made him what he is today.

A. why
B. when
C. which
D. that

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单项选择题

This coastal area（）a national wildlife reserve last year.

A. was named
B. named
C. is named
D. names

单项选择题

You（）buy a gift, but you can if you want to.

A. must
B. mustn't
C. have to
D. don't have to

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