问题描述：
状语从句
____ the poem a second time,the meaning will become clearer to you.
A.Your having read B.While reading
C.If reading D.When you read
_____ your composition carefully ,some spelling mistakes can be avioded.
A.Having checked B.Checked C.If you check D.To check
____ the poem a second time,the meaning will become clearer to you.
A.Your having read B.While reading
C.If reading D.When you read
_____ your composition carefully ,some spelling mistakes can be avioded.
A.Having checked B.Checked C.If you check D.To check
问题解答：
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