Question

"________ your composition carefully, some spelling mistakes can be avoided."

A. Having checked
B. Check
C. If you check
D. To check

Answer 1

答案C
现在分词和不定式作状语，其逻辑主语必须是句子主语，填入A或D项意思就不通了，所以应改成if引导的条件状语从句，正确答案为C.例如：If it is fine tomorrow，we will go and visit the museum．
如果明天天晴，我们将去参观博物馆.