单项选择题
A.in B.since C.for
The （）of employees in this company has doubled.A.sumB.a...
单项选择题The （）of employees in this company has doubled.
A.sum B.amount C.number
The Europeans （）to stay ahead in aeroplane design.A.fai...
单项选择题The Europeans （）to stay ahead in aeroplane design.
A.failed B.missed C.lost
Mary （） into the room.A.burstB.crashedC.hit
单项选择题Mary （） into the room.
A.burst B.crashed C.hit
