单项选择题

Guests （）sign in at the front desk to enter the building

A. can
B. may not
C. must
D. used to

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单项选择题

Molly has a fake tooth that is made （）pure gold

A. by
B. with
C. for
D. of

单项选择题

I like to travel but I （）never gone abroad

A. have
B. having
C. was
D. 什么都不填

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