15. He his doctor’s care he is quite well again.A. owes it to; whatB. owes to; thatC. ow

问题补充：

15. He his doctor’s care he is quite well again.

A. owes it to; what

B. owes to; that

C. owes them to; that

D. owes it to; that

答案：

A. owes it to; what

B. owes to; that

C. owes them to; that

(答案→)D. owes it to; that

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