单项选择题

So many representatives () , the conference had to be postponed.

A. to be absent
B. were absent
C. being absent
D. was absent

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This cloth is obviously inferior () real silk.

A. than
B. to
C. for
D. on
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Before the final examination, the teacher told the student: Two hours () the limit of the test.

A. are
B. has been
C. would be
D. is
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