14．Language experts claim that children _________ to the English-speaking environment will pick up English quickly．（　　）
A．being exposedB．having been exposed
C．to be exposedD．exposed

分析 語言專家宣稱身處英語語言環(huán)境中的兒童會在不知不覺中快速學會英語．

解答 答案：D 句中expose作children的后置定語；expose sb to sth讓自己暴露在某物下，句中expose與children構(gòu)成動賓關(guān)系，且句意表達的是客觀事實，要用表示被動的過去分詞．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）．學習時，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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