A virus, often too small to be seen except with a powerful microscope, ________diseases.

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问题 A virus, often too small to be seen except with a powerful microscope, ________diseases.

选项 A、cause
B、is caused
C、causes
D、is causing

答案C

解析本题的主语是“A virus”，动词cause作谓语，二者之间是主动关系，且题干的叙述属常理，用一般现在时，故应使用“causes”。故正确答案为C。

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GCT工程硕士（英语）

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