The giant pharmaceutical company insists that its new drug is______safe as long as it used under the supervision of a doctor.

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问题 The giant pharmaceutical company insists that its new drug is______safe as long as it used under the supervision of a doctor.

选项 A、perfect
B、perfection
C、perfectly
D、perfecting

答案C

解析 省略横线处所填单词,本句也能构成完整结构,因此横线处应填入副词。答案是(C)perfectly。
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