问题
选择题
By _______ the heart ______a pump, he helped the children to understand its function.[ ]
A. compared, to
B. comparing, to
C. comparing, with
D. compared, with
答案
答案：B
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By _______ the heart ______a pump, he helped the children to understand its function.[ ]
A. compared, to
B. comparing, to
C. comparing, with
D. compared, with
答案：B