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外语
_____a living plant, animal, or bacterial cell, they make use of the host cell’s chemical energy.
_____a living plant, animal, or bacterial cell, they make use of the host cell’s chemical energy.
admin
2019-07-01
62
问题
_____a living plant, animal, or bacterial cell, they make use of the host cell’s chemical energy.
选项
A、Viruses enter
B、Viruses entering
C、Do viruses enter
D、When viruses enter
答案
D
解析
The first clause needs a beginning. When viruses enter is a subordinator + subject + verb structure, which forms the beginning of an adverb clause.
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