题目内容
The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused | B．to have caused | C．being caused | D．causing |
A
解析试题分析：句意：流感被认为是由在人类鼻腔和喉腔细胞内繁殖的病毒引起的。名词+be+believed/said/reported+不定式”相当于“It is believed/said/reported that…”，可以看作是一个句型。flu与cause之间是一种动宾关系，所以应该用动词不定式的被动式，选A.
考点：考查非谓语动词。
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| A．to compare | B．comparing |
| C．being compared | D．compared |
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| A．to make | B．making | C．being made | D．to be made |
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| A．struggled | B．having struggled | C．struggling | D．to struggle |
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| A．breaking | B．having broken | C．to be broken | D．to have broken |
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| A．deal | B．dealt | C．to deal | D．dealing |
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| A．calling | B．call | C．to call | D．called |
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| A．injuring; were | B．injuring; was |
| C．injured; was | D．injured; were |
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| A．choose | B．chosen | C．choosing | D．to choose |