题目内容
21、I ______ for three hours when I suddenly became sick.
A. had been working B. would work
C. have worked D. am working
试题答案
21、A
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I ______ for three hours when I suddenly became sick.
A. had been working B. would work
C. have worked D. am working
查看习题详情和答案>>I _____ for three hours when I suddenly became sick.
A. had been working B. would work C. have worked D. am working
查看习题详情和答案>>
I ________ for three hours when I suddenly became sick．
[ ]
A．
had been working
B．
would work
C．
have worked
D．
am working