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while___the book,he noddded from time to time.A read B he re

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while___the book,he noddded from time to time.A read B he reads C reading D reads
为什么?
while___the book,he noddded from time to time.A read B he re
C 当主语一致,且有连词,可省略主语与be动词.主语he与reading为主动关系,所以填reading
再问: 为什么read要加 ing
再答: 因为省略了be动词,原句相当于while he was reading the book,he noddded from time to time
再问: 为什么是reading而不是别的 谢谢
再答: 如果没有he,需用ing形式,AD不对,如果选B,应该是while he was reading the book,he noddded from time to time。while引导从句一般用进行时。