9、The maths problem is very difficult．We had better ________ the teacher for help．

A．to ask              B．a(chǎn)sking                   C．a(chǎn)sked                D ask

9、D

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The maths problem is very difficult．We had better ________ the teacher for help．

A．to ask              B．a(chǎn)sking                   C．a(chǎn)sked                D ask

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