to 只有两种可能,1.是介词,后面跟名词、代词和动名词.
2.是动词不定式的小品词,即构成to do 这个结构,此时后面只能跟动词原形.
因此不可能跟must.
上面的题目我认为后面多了一个空格,只要填useful,to learn 就行了.
to 后是否可以加情态动词English is very useful and we must learn it wel
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