Public health experts say that (the) money one spends (avoiding) illness is (less) than the cost (to be) sick.

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问题 Public health experts say that (the) money one spends (avoiding) illness is (less) than the cost (to be) sick.

选项 A、the
B、avoiding
C、less
D、to be

答案D改为on to be sick

解析 意为“花费在某方面的……”。
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