单项选择题

Dr. Bethune worked hard as if he ______.

A. never had felt tired

B. had never felt tired
C. never felt tired


D. was tired never
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单项选择题
______ in this way, the situation doesn’t seem so disappointing.
A. To look at


B. Looked at
C. Looking at


D. To be looked at
单项选择题
It is about time he ______ strong action against them.
A. is taking
B. takes

C. took

D. will take
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