I'm afraid the boy has some problems______(work out)such a hard maths proublem.

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I'm afraid the boy has some problems______(work out)such a hard maths proublem.

I'm afraid the boy has some problems______(work out)such a hard maths proublem.
I'm afraid the boy has some problems______(work out)such a hard maths proublem.

I'm afraid the boy has some problems______(work out)such a hard maths proublem.
应该是working out have problems doing sth

working out

working out

in working out

working out
have problems doing sth