这句 put..in 是动词短语,后面的 in 必须要跟前面的 put 连在一起；因此后面仍然该加不定式 to make.
把句子改为陈述句就可以看出来了：
We must put this in to make banana milk shake.
如果动词是 add 就没这个问题 Must we add this ... ?
Must we put this in (to make/making) banana milk shake?
3个回答
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