The house____across the river will be the teachers' dormitory when completedA.built B.being built C.building D.having built房子被造,那为什么要变成ing啊?be built不可以嘛?还有句中the river后面怎么可以加will be 起到什么作用?这句句子的结构是什么啊?非常困惑.
问题描述：
The house____across the river will be the teachers' dormitory when completed
A.built B.being built C.building D.having built
房子被造,那为什么要变成ing啊?be built不可以嘛?还有句中the river后面怎么可以加will be 起到什么作用?这句句子的结构是什么啊?非常困惑.
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