单项选题
1) () the poem a second time , its meaning will become clearer to you。
a)Your having read b)While reading
c)If reading d)When you read
答案是什么?为什么我总觉得bcd都可以呢?
·2) ()your composition careful ,you can at least avoid some spelling mistakes。
a)Check b)To check
c)Having checked d)If you check
答案是什么?解释一下吧,帮我!谢谢!



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