单项选择题

There were dirty marks on her trousers () she had wiped her hands.

A.where
B.which
C.when
D.that

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Henry, () headmaster of a primary school, is her husband.

A.the
B.a
C.an
D./
单项选择题
The number of computers in the library()twenty.

A.is
B.are
C.have been
D.be
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