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单选题 7. Some students have difficulty _____ English, so they often ask their English teacher for help.

A

learn

B

to learn

C

learning

D

learnt

正确答案 :C

解析

本题考查固定搭配。
have difficulty in (doing) sth.为固定搭配,介词in之后跟动词-ing或名词, 故C项符合题意。故本题答案为C。

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