相关考题
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单项选择题
The police knew the （） of the accident.
A.cause
B.reason
C.result -
单项选择题
The pilot turned engine （） and is ready to take off.
A.up
B.off
C.on -
单项选择题
Progress has been （） in aeroplane design.
A.done
B.made
C.produced
