In what way did Dr. Cohen help explain why so many Americans die of drug reactions? In the last paragraph, the phrase "tinkerin

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问题 In what way did Dr. Cohen help explain why so many Americans die of drug reactions?
In the last paragraph, the phrase "tinkering with" may be replaced by______

选项 A、trifling with.
B、concurring with.
C、fiddling with.
D、playing with.

答案C

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