单项选择题

One of the workers (has) (hung) the curtains that (had) been (laying) on the floor.

A. has
B. hung
C. had
D. laying
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单项选择题
(Lost in thought), she (didn't hear) the thunder (to begin) in the mountains (far off).
A. Lost in thought
B. didn't hear
C. to begin
D. far off
单项选择题
He demanded that the problem ______ at once.
A. would be solved
B. is to be solved
C. is solved
D. be solved
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