22. Food aid is the key to the problem now.A. only solve discussedB. alone solving be

问题补充：

22. Food aid is the key to the problem now.

A. only, solve, discussed

B. alone, solving, being discussed

C. merely, solving, being discussed

D. alone, solve, being discussed

答案：

A. only, solve, discussed

(答案→)B. alone, solving, being discussed

C. merely, solving, being discussed

D. alone, solve, being discussed

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