题目内容
Such materials were used to _______ houses in the past.
A. build B. building
C. being built D. built
A
be used to do表示“被用来做……”。
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题目内容
Such materials were used to _______ houses in the past.
A. build B. building
C. being built D. built
A
be used to do表示“被用来做……”。