单项选择题

No sooner had Tom seen Jim （）he left the room.

A. when
B. before
C. than
D. then

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单项选择题

（） we will do next is still under discussion.

A. That
B. When
C. Where
D. What

单项选择题

Mary wishes that she （）law instead of history when she was in college.

A. had studied
B. studies
C. has studied
D. studied

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