while___the book,he noddded from time to time.A read B he reads C reading D reads为什么?

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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 reads C reading D reads
为什么?

while___the book,he noddded from time to time.A read B he reads C reading D reads为什么?
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