Biology teachers often _______ the heart and a pump in order to help students understand how the heart works. A、 made an analogy between B、 made analogy between C、 make an analogy between D、 make analogy between

Biology teachers often _______ the heart and a pump in order to help students understand how the heart works.
A、
made an analogy between

B、
made analogy between

C、
make an analogy between

D、
make analogy between

出自：河北农业大学大学英语Ⅳ

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