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

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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
单项选择题
No one doubts () he is the best leader in the company.

A. whether
B. if
C. what
D. that
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