单项选择题
A.having
B.had
C.having been
D.have
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单项选择题
A.initiationB.evidenceC.incidenceD.indication
A.initiation
B.evidence
C.incidence
D.indication
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单项选择题
The word bug used in Paragraph 5 means ______.
A.a bacterium
B.a cold
C.a flu
D.a virus
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