It appeared that X-rays are not bent, as light is, when______through glass and water.

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问题 It appeared that X-rays are not bent, as light is, when______through glass and water.

选项 A、passed
B、passes
C、being passed
D、passing

答案D

解析本题考查非谓语动词，从句的逻辑主语和主句的主语相同，所以用现在分词。题意为，X光似乎和光一样，在通过玻璃和水时，不弯曲。

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