some of the plastie bags can’t ( )now.—yes .people will use environmental bags instead.A use B be use C be used D are used.说理由啊

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some of the plastie bags can’t ( )now.—yes .people will use environmental bags instead.
A use B be use C be used D are used.
说理由啊

1.答案：C.
2.翻译：--有一些塑料袋现在不能被使用了.--是啊,人们将会改用环保袋.
3.
1）句意很明显：塑料袋是被使用的,所以是被动语态结构：be + 动词过去分词.由此可以排除AB.
2）此句含有情态动词can't,其后必须加be动词的原形be,所以答案是be used,而不是are used.
由此排除D,选择C.

C 被动语态

C be used
某些塑料袋现在已经不能被用到了。
--是的，人们用环保袋来代替了。
首先，不考虑句子的意思什么的，看到can't就应该想到can后面应该跟的是动词原形，所以首先把D排除掉。
再就是第一个句子的主语是bag，所以 bag 只能是被用，用被动形式，而被动结构就是 be + 过去分词。所以只能选C....

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C be used
某些塑料袋现在已经不能被用到了。
--是的，人们用环保袋来代替了。
首先，不考虑句子的意思什么的，看到can't就应该想到can后面应该跟的是动词原形，所以首先把D排除掉。
再就是第一个句子的主语是bag，所以 bag 只能是被用，用被动形式，而被动结构就是 be + 过去分词。所以只能选C.

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