单项选择题

Keep this reference book; it may come in () one day.

A.handy
B.useful
C.convenient
D.helpful

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单项选择题
Two bright and beautiful eyes are his most memorable facial ().

A. mark
B. feature
C. trace
D. appearance
单项选择题
As an outstanding scholar, he has become () to the research team.

A. superior
B. senior
C. indispensable
D. independent
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