题目内容

Only ____________ of the United States may vote in the election.

A. persons
B. people
C. citizens
D. natives

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Homework on time will lead to better grades.

A. done
B. be done
C. having done
D. to have done

The students all tell their problems to one of the more ____________teachers.

A. sympathetic
B. real
C. typical
D. understanding

Materials have now become one of the most important factors ______ the advance of technology and industry depends.

A. on which
B. with which
C. of which
D. for which

Sailors like to go sight-seeing when they are ____________ in a foreign port.

A. off duty
B. in common
C. by chance
D. ahead of

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