单项选择题

Scientists are ______ certain that there is a cancer-inhibiting agent in the blood of the shark.

A. dubiously
B. virtually
C. queerly
D. randomly
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单项选择题
Your complaint is being （）; when we have anything to report we’ll write to you again.

A. looked through
B. looked over
C. looked after
D. looked into
单项选择题
She once again went through her composition carefully to ______ all spelling mistakes from it.
A. eliminate
B. withdraw
C. diminish
D. delete
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