单项选择题

Over 500 people ______ in the building when the fire ______.

A. worked;was out
B. was working;was broken out
C. were working;breaked out
D. were working;breke out
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单项选择题
They ______ never ______ each other since they met last.
A. had; seen
B. did; see
C. have; seen
D. have; saw
单项选择题
______ very late, we took candles and went upstairs.
A. It was
B. It being
C. It is
D. It gets
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