I didn’t know ________. A．when did the plane take off B．when the plane took off ...
Ididn’tknow________.A．whendidtheplanetakeoffB．whentheplanetookoffC．whentheplanetakeso...
I didn’t know ________. A．when did the plane take off B．when the plane took off C．when the plane takes off D．when does the plane take off
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| B |
| 特殊疑问词作宾语从句，将特此作为连接词，后接陈述句语序。故选B |
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