问题
选择题
He didn't realize he had forgot his bag _____ the plane had taken off.
A．unless
B．until
C．if
D．or
答案
B
考查连词辨析。此处为直到---才---的意思，故选B符合。
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He didn't realize he had forgot his bag _____ the plane had taken off.
A．unless
B．until
C．if
D．or
B
考查连词辨析。此处为直到---才---的意思，故选B符合。