题目内容

I _____ for three hours when I suddenly became sick.

　 A. had been working　 B. would work　 C. have worked　 D. am working

A

for three hours时间状语表明动作的延续，后面的时间状语从句圈定要用过去时

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相关题目

I stopped ________ a rest for I ________ for three hours.

[　　]

A． having, had worked　　　B． having, have worked

C． to have, had worked　　　D． to have, have worked

I ________ for three hours when I suddenly became sick．

A．had been working

B．would work

C．have worked

D．am working

I ________ for three hours when I suddenly became sick．

had been working

would work

have worked

am working

I stopped a rest for I for three hours.

A.
having, had worked
B.
having, have worked
C.
to have, had worked
D.
to have, have worked