单项选择题

My father is good at solving this kind of problem. If only he ______ here!

A. were
B. will be
C. was
D. is
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单项选择题
What you are doing ______ very important in your work.
A. seemed
B. seems
C. seem
D. is to seem
单项选择题
The most important environmental influence on fish is water temperature, for fish tend to ______ the temperature of their surroundings.
A. avoid
B. exceed
C. assume
D. regulate
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