题目内容

---Mr. Wang, I have trouble       the text.
--- Remember       it three times at least.
A.to understand; readingB.understanding; reading
C.understanding;to readD.to understanding; to read
C
have some trouble in doing sth,第一空用动名词,故将A的排除,根据上下文,可知后文说的是记得曾经做某事,故用动名词,故选答案为C
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