單項(xiàng)選擇題She didn’t leave for the airport （） you came.

A.unless
B.until
C.if


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1.單項(xiàng)選擇題That book gives a very vivid （） of that city.

A.picture
B.photo
C.view

2.單項(xiàng)選擇題The police knew the （） of the accident.

A.cause
B.reason
C.result

3.單項(xiàng)選擇題The pilot turned engine （） and is ready to take off.

A.up
B.off
C.on

4.單項(xiàng)選擇題Progress has been （） in aeroplane design.

A.done
B.made
C.produced

5.單項(xiàng)選擇題The question was so difficult that （） people could answer it.

A.little
B.afew
C.few