单项选择题

-- Why do you look worried
-- Fred left the company half an hour ago. His work ______ unfinished since.

A. left
B. was left
C. has left
D. has been left
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单项选择题
______ until 1972 ______ we began studying English.
A. It was not ... that

B. It was not ... when
C. It is not ... that

D. It is not ... when
单项选择题
They really have a great time too, designing everything, drawing the blue prints, ______ the angles and so on.
A. looking out
B. taking out
C. finding out
D. figuring out
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