Look,the light is still on in his study.he()at moment为什么是 is studying而不是muct be studying

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Look,the light is still on in his study.he()at moment为什么是 is studying而不是muct be studying
Look,the light is still on in his study.he()at moment
为什么是 is studying
而不是muct be studying

Look,the light is still on in his study.he()at moment为什么是 is studying而不是muct be studying
这道题中look是现在进行时标志,只要你填的是现在进行时就可以.所以说在语法上你填写muct be studying 也没有任何问题,而且语气也更加强烈.但是这是一种习惯,通常含有look、listen等的现在进行时标志,你就直接用be+动词ing就可以了,你用的must涉及到情态动词了,可能老师觉得有点小题大做了.但是强调一句,你写的在语法上也没问题!