4．_______ from endless homework on weekends，the students now find their own activities，such as attending school literature clubs．（　　）
A．Having freedB．FreeingC．To be freedD．Freed

分析 周末從無休無止的作業(yè)中解脫出來，學(xué)生們現(xiàn)在可以找到自己的活動了，例如參加學(xué)校文學(xué)俱樂部．

解答 答案：D 題干中有逗號分隔，沒有連詞，要用非謂語動詞；free sb from從某事中解脫出來，free與主語students構(gòu)成動賓關(guān)系，且句意表達(dá)的是客觀事實(shí)，要用過去分詞作原因狀語．故選D．

點(diǎn)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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