A virus is harmful because______reproduces by killing the host cell.A、itB、it is

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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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Avirusisharmfulbecause______reproducesbykillingthehostcell.A、itB、itis