When I heard the sad news,my heart1、________,my heart ______.A.On hearing the sad news,sank B.Hearing the sad news,dropped C.At the sad news,fell D.When I heard the sad news,sank为什么不能选A

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When I heard the sad news,my heart1、________,my heart ______.A.On hearing the sad news,sank B.Hearing the sad news,dropped C.At the sad news,fell D.When I heard the sad news,sank为什么不能选A
When I heard the sad news,my heart
1、________,my heart ______.
A.On hearing the sad news,sank B.Hearing the sad news,dropped
C.At the sad news,fell D.When I heard the sad news,sank
为什么不能选A

When I heard the sad news,my heart1、________,my heart ______.A.On hearing the sad news,sank B.Hearing the sad news,dropped C.At the sad news,fell D.When I heard the sad news,sank为什么不能选A
因为A是独立主格结构,他的主语是I.主句的主语是my heart,这两个不一样,所以a的话要在hearing前面加上my这个主语.

因为前后句主语不一致,前半句主语是“I”,后半句是“my heart”,on doing这种句式只能在主语一致时使用。明白?