单项选择题

Only twenty percent of the work（）done yesterday.

A. has
B. was
C. have
D. were

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单项选择题
He tried many times to sneak across the border to a neighboring country,（）caught each time.

A. having been
B. only to be
C. always being
D. unfortunately
单项选择题
All（）has already been done.

A. can be done
B. should be done
C. that can be clone
D. what should be done
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