it would be possible to build a platform.A platform____ 1 co

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it would be possible to build a platform.A platform____ 1 could build 2 would be built
3 could be built 4 would build
请问选择哪一个,及分别说出每个为什么对与错

首先,it would be possible to build a platform.是it做形式主语,不定式是真正主语,用了过去将来时,翻译为“当时建造一个平台将是可能的.”,这句话说了一种可能性,而can作为情态助动词使用时,其中一种用法就是表示可能性的.3中让平台作了主语,要用被动语态,谓语动词采用一般过去时、被动语态的could be built,翻译为“能够被建造”,这样就和第一句是一样的意思.而1未使用被动语态,错误； 2 中would be built 是去将来时,翻译为“当时将被建造”,没有忠实于第一句中对可能性的描述,错误；4 在的would build除了使用主动语态的错误外,也未表示可能性,错误.

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