摘要：I found it difficult out the problem .

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I found ________ difficult to work out the problem without a computer.

A．that

B．it

C．this

D．myself

I found _________difficult to work out the problem.

A it’s B this C that D it

I found _________difficult to work out the problem.

A it’s B this C that D it

I found ________difficult to work out the problem in five minutes.

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