请教一道英语语法题,为什么The parents watched the children _________ thei
请教一道英语语法题,为什么
The parents watched the children _________ their invention.
A.demonstrating B.demonstrate C.to demonstrate D.demonstrated
The parents watched the children _________ their invention.
A.demonstrating B.demonstrate C.to demonstrate D.demonstrated
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你能帮帮他们吗