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問題詳情:

 Totheirsurprise,theyfoundthelecturegivenbythefamousepr...

 To their surprise, they found the lecture given by the famouse professor easy________.

A. to be understood                B. to understand

C. understanding                    D. understood

【回答】

 B

知識點:非謂語動詞

題型:選擇題

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