单项选择题

Mary has got a furl mark in the test. She（）very hard all the time.

A. will work
B. must have worked
C. may work
D. could have worked

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单项选择题
Mike was walking along the street（）he ran into an old friend.

A. who
B. when
C. which
D. whom
单项选择题
She is（）far the most active member in our group.

A. so
B. as
C. by
D. in
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