2. 外语
  3. _____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.

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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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