Johnson’s paper ______three processes for generating hydrogen in fuel cells.A、co

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问题 Johnson’s paper ______three processes for generating hydrogen in fuel cells.

选项 A、compares
B、comparisons
C、is compared
D、was a comparison

答案 A

解析从上下文我们可以看出横线上需要的是一个动词，所以首先将comparisons排除。再看横线后面紧跟宾语(three processes)，所以主动语态的compares是符合要求的正确选项。

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Johnson’spaper______threeprocessesforgeneratinghydrogeninfuelcells.A、co