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Grandpaisgettingoldandhehastrouble

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問題詳情:

Grandpaisgettingoldandhehastrouble

Grandpa is getting old and he has trouble ________ what others say to him.

A. hear        B. to hear        C. hearing    D. heard

【回答】

C

知識點:非謂語動詞

題型:選擇題