四、3.本题答案是什么Weighing nine hundred pounds,( ).A.the piano was
四、3.本题答案是什么
Weighing nine hundred pounds,( ).
A.the piano was unable to move
B.the piano was too heavy for her to move
C.the piano could not been moved
D.she could not move the piano ,答案应选什么（单选题）.
这道题讲了一个什么语法的问题,以及之所以选此答案的原因是什么.请高手们帮我详细的分析分析.
Weighing nine hundred pounds,( ).
A.the piano was unable to move
B.the piano was too heavy for her to move
C.the piano could not been moved
D.she could not move the piano ,答案应选什么（单选题）.
这道题讲了一个什么语法的问题,以及之所以选此答案的原因是什么.请高手们帮我详细的分析分析.
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