6. (单选题) The girl sometimes has difficulty ______ what the teacher says in class. ( )(本题2.0分) A、 understand B、 understanding C、 to understand D、 understood

6. (单选题) The girl sometimes has difficulty ______ what the teacher says in class. ( )(本题2.0分)
A、 understand
B、 understanding
C、 to understand
D、 understood

出自：洛阳理工学院-英语2(高起专)

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