The problem is difficult for a little girl toA.work out B.work it out C.work out it

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The problem is difficult for a little girl toA.work out B.work it out C.work out it

The problem is difficult for a little girl toA.work out B.work it out C.work out it
The problem is difficult for a little girl to
A.work out B.work it out C.work out it

The problem is difficult for a little girl toA.work out B.work it out C.work out it
A.
若加"it",只能理解为"problem",会导致句子结构混乱,无法理解.
但可以说"It is difficult for alittle girl to work out the problem."其中"it"是形式主语,不是指"problem",而是指整个后面的"for alittle girl to work out the problem".

a 不加宾语

a

a

选A

a

a
sth is adj for sb to do

A

A

显然是A嘛

a