All we have to do_____ learn by heart.里填那个(A.is to B.to C.are to D.be to)

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All we have to do_____ learn by heart.里填那个(A.is to B.to C.are to D.be to)

All we have to do_____ learn by heart.里填那个(A.is to B.to C.are to D.be to)
All we have to do_____ learn by heart.里填那个(A.is to B.to C.are to D.be to)

All we have to do_____ learn by heart.里填那个(A.is to B.to C.are to D.be to)
A
all在这里没有具体说什么,所以看成一个抽象的东西,当成不可数名词,后用is,is后的表语或者是不定式,或者是动名词,所以A