2. 外语
  3. A virus is harmful because______reproduces by killing the host cell.

A virus is harmful because______reproduces by killing the host cell.

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问题 A virus is harmful because______reproduces by killing the host cell.
选项 A、it
B、it is
C、can it
D、it can
答案A
解析 The subordinate clause needs a subject; it is a subject pronoun.
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