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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单项选择题

He doesn't seem to be able to do it, () I thought he could.

A.though
B.since
C.if
D.because

单项选择题

The horse is getting old and can't run () it did.

A.as faster as
B.so fast than
C.so faster as
D.as fast as

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