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
A.
compared, to
B.
comparing, to
C.
comparing, with
D.
compared, with
拍照语音搜题,微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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