单项选择题

When I arrival, the lecture had already started and the professor ______ something on the blackboard.

A. wrote
B. had been writing
C. is writing
D. was writing
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单项选择题
Jack would rather spend time complaining than ______ the problem by himself.
A. solve
B. solved
C. solves
D. to solve
单项选择题
The proposal ______, we'll have to make another decision about when to start the project.
A. accepted
B. accepting
C. to accept
D. be accepted
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