摘要：19．We’d better set off now, or it will be dark we know it. A．until B．after C．when D．before
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We'd better set off now, or it will be dark we know it.
[ ]
A. until
B. after
C. when
D. before
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B. after
C. when
D. before
We'd better set off now or it will be dark ______ we know it.
[ ]
A. before
B. as
C. when
D. because
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B. as
C. when
D. because
We'd better set off now, or it will be dark _____ we know it.
[ ]
A. until
B. after
C. when
D. before
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B. after
C. when
D. before
A．until B．after C．when D．before