问题描述：
The boys are making model planes over there.(对画线部分提问)
The boys are making model planes over there.（对画线部分提问） _____ the boys _____ over there?
画线的是are making model planes
不要说前面少了条线,要画线的是 making model planes 才能问 What are the boys doing over there?现在多画了个are.我就不会了.
The boys are making model planes over there.（对画线部分提问） _____ the boys _____ over there?
画线的是are making model planes
不要说前面少了条线,要画线的是 making model planes 才能问 What are the boys doing over there?现在多画了个are.我就不会了.
问题解答：
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