单项选择题

He looks worried; I think he______in the exam.

A. must have failed

B. ought to have failed
C. should have failed

D. must fail
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Professor Wang, ______for his informative lectures, was warmly received by his students.
A. knowing

B. known
C. to be known

D. having known
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Someone must have left the tap on, ______the water was running over and flooding the bathroom.
A. for
B. therefore
C. moreover
D. however
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