单项选择题

It is not easy to learn English well, but if you (), you will succeed in the end.

A. hang up
B. hang about
C. hang on
D. hang onto

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单项选择题
It is necessary that an efficient worker () his work on time.

A. accomplishes
B. can accomplish
C. accomplish
D. has accomplished
单项选择题
The preservation of embryos and juveniles is a () occurrence in the fossil record.

A. scarce
B. lack
C. rare
D. short
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