单项选择题

China's sport stars Yao Ming and Liu Xiang ______ Goodwill Ambassadors(亲善大使)for Shanghai.

A. has been named
B. have been named
C. have named
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The headmaster ______ for more than two weeks.
A. has left
B. has gone
C. has been away
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It is much ______ to go up than it is to come down.
A. hard
B. harder
C. hardest
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