Tom has trouble _______ what the teacher says in English class.

A、understand
B、to understand
C、understands
D、understanding
D
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科目：初中英語 來源：廣東省期中題 題型：單選題

Tom has trouble _______ what the teacher says in English class.
[     ]
A、understand
B、to understand
C、understands
D、understanding

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