单项选择题

The Smiths______ the Summer Palace three times.

A. have gone to
B. have been in
C. have been to
D. have gone into
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单项选择题
21（）

A．what
B．that
C．which
D．it
单项选择题
Which of the following is not mentioned in the three advertisements（）

A．Marriage.
B．Male or female.
C．Education.
D．Working experienc
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