单项选择题

Mack is very busy; he is a full-time student, while () a part-time job.

A.to hold
B.being held
C.held
D.holding

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单项选择题

Kate is an honest girl; I say it, () I don't like her.

A.as if
B.as long as
C.as though
D.even if

单项选择题

Although it was not named ()1782, this kind of metal was used as early as 5300 B. C.

A.for
B.in
C.until
D.since

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