7．So far，several cases of a disease，         as H1N1，are reported to have been found in the country．（　�。�
A．knowingB．to be knownC．having knownD．known

分析 到目前為止，幾個病例，即為人所熟知的H1N1，據(jù)報道已經(jīng)在這個國家被發(fā)現(xiàn)．

解答 答案：D 句中有逗號分隔，沒有連詞，要用非謂語動詞；be known as被人熟知，know與disease構(gòu)成動賓關(guān)系，且句意表達的是客觀事實，要用過去分詞形式．故選D．

點評 過去分詞是非謂語動詞的一種，用法很靈活，分為簡單式done（表示與謂語同時或幾乎同時發(fā)生的動作）；完成式having been done（表示先于謂語的動作）．學(xué)習(xí)時，要把握其用法特征：表示被動和完成．同時還要注意區(qū)分現(xiàn)在分詞和不定式．

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