4．-I wonder why the thinnest plastics bags，though ________，are still in use here．
-Well，it's no easy job to solve this problem effectively．（　　）
A．banningB．bannedC．to banD．having banned

分析 -我想知道為什么被禁止了的超薄塑料袋在這個地方仍然在使用．
-哦，要有效解決這個問題并不容易．

解答 答案：B
題干中though引導讓步狀語從句，即though the thinnest plastics bags are banned，從句中省略了與主句相同的主語和系動詞，故選B．

點評 省略句是英語的一種習慣用法．按照語法的分析，句子應該具備的成分，有時出于修辭上的需要，為了避免重復、突出新信息使上下文緊密連接的修辭手段．單詞，短語，分句，都可以省略．

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