2. 专升本
  3. Since 1970, millions of enthusiasts______Vitamin C, which they believe can remedy the common cold.

Since 1970, millions of enthusiasts______Vitamin C, which they believe can remedy the common cold.

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问题 Since 1970, millions of enthusiasts______Vitamin C, which they believe can remedy the common cold.
选项 A、have taken
B、have been taken
C、have been taking
D、has been taking
答案C
解析
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