选择题：Which of the following is closest in meaning to the underlined word “plummeted”

题目内容：

Which of the following is closest in meaning to the underlined word “plummeted” in Paragraph 3?

A.Punished timely

B.Spread widely

C.Continued gradually

D.Dropped sharply

参考答案：

答案解析：

__________your valuable help, we couldn't have finished the experiment ahead of

__________your valuable help, we couldn't have finished the experiment ahead of time.

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