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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单项选择题

Father（）goes to the gym with us although he dislikes going there.

A. hardly
B. seldom
C. sometimes
D. never

单项选择题

Listen! Do you hear someone（）for help

A. calling
B. call
C. to call
D. called

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