单项选择题

The new research project was led by the()engineer.

A. main
B. major
C. chief
D. primary

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单项选择题
One must keep calm in () time of danger.

A. a
B. the
C. that
D. /
单项选择题
He has the same color of hair and eyes () his father.

A. like
B. as
C. to
D. of
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