caused? 由病毒导致
carried? 由病毒携带
都有可能
The flu is believed ______ by viruses that like to reproduce
The flu is believed ______ by viruses that like to reproduce
in the cells inside the human nose and throat.
后面1半
in the cells inside the human nose and throat.
后面1半
英语人气：789 ℃时间：2020-02-05 00:52:52
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