When we got to the top of the hill,I could feel my heart _____.A.beat B.beating C.beats D is beating 我想问为什么不是D?什么时候加 is 什么时候不加?

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When we got to the top of the hill,I could feel my heart _____.A.beat B.beating C.beats D is beating 我想问为什么不是D?什么时候加 is 什么时候不加?

When we got to the top of the hill,I could feel my heart _____.A.beat B.beating C.beats D is beating 我想问为什么不是D?什么时候加 is 什么时候不加?
When we got to the top of the hill,I could feel my heart _____.
A.beat B.beating C.beats D is beating 我想问为什么不是D?什么时候加 is 什么时候不加?

When we got to the top of the hill,I could feel my heart _____.A.beat B.beating C.beats D is beating 我想问为什么不是D?什么时候加 is 什么时候不加?
正确答案是B 因为FELL是感官动词,后面要加ING 的