问题描述：
Why are they pulling down the houses?----_____a new office building.
A.To make room for B.making room for
C.Make room for D.having made room for
写出原因!并说明ABCD有什么区别
A.To make room for B.making room for
C.Make room for D.having made room for
写出原因!并说明ABCD有什么区别
问题解答：
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