摘要：They didn’t go to bed they finished their homework. A. until B. because C. when
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They didn't go to bed ______ they finished their homework.
[ ]
A. until
B. because
C. when
D. if
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B. because
C. when
D. if
They
didn’t go to bed ______ they finished their homework.
A. until B.because C.when D.if
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They didn’t go to bed ________ they finished their homework.
| A．when | B．because | C．until | D．if |