【題目】When the telephone rang, I happened ______ a book.

A. to be reading B. to read

C. read D. to have read

【答案】A

【解析】試題分析：考查動詞的時態(tài)和語態(tài)。句意：電話響起的時候我正好在讀一本書。不定式的進行式，表示正在做某事，故選A。

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