The roof fell ______ the PLA men had time to rescue the child trapped in the house.
A.until
B.unless
C.before
D.because
答案:C
fall 是短暂性动词,所以不能用until,此句意思应该是“解放军还没有救出被困在房子里的小孩,房顶就掉下来了。”所以答案C。
The roof fell ______ the PLA men had time to rescue the child trapped in the house.
A.until
B.unless
C.before
D.because
答案:C
fall 是短暂性动词,所以不能用until,此句意思应该是“解放军还没有救出被困在房子里的小孩,房顶就掉下来了。”所以答案C。