单项选择题

I think that the Great Wall is worth（）hundreds of miles to visit.

A. to travel
B. traveling
C. traveled
D. travel

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单项选择题

The new staff didn’t know how to use the system（）I explained it to him yesterday.

A. until
B. because
C. if
D. since

单项选择题

（）is reported in the newspapers that the talks between the two companies have not made any progress.

A. That
B. What
C. It
D. As

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