．Hard you may try you can’t possibly persuade Tom to give up smoking for he is so addict

问题补充：

．Hard you may try, you can’t possibly persuade Tom to give up smoking, for he is so addicted to it.

A. Whatever

B. However

C. Whichever

D. Whenever

答案：

A. Whatever

(答案→)B. However

C. Whichever

D. Whenever

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