单选题：Thesymptomsofthepatientsafterbeinginfectedmayfirstappear____

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题目内容：

Thesymptomsofthepatientsafterbeinginfectedmayfirstappear__________ A．infectedbodyfluids
B．againsttheoutbreakseverity
C．themodeoftransmission
D．theinitialdaysofbeinginfected
E．threecountriesinWestAfrica
F．withinawiderangeofdays

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