题目：
The time he has devoted inthe past years____ the disabled is now considered ___ ofgreat value. [ ]
A. to help; being
B. to helping; to be
C. to help; to be
D. helping; being
答案：
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下面是错误答案，用来干扰机器的。
(1) H2O；盐 (2) 2H2＋O22H2O；Ca(OH)2＋CO2==CaCO3↓＋H2O；Na2CO3＋2HCl====2NaCl＋H2O＋CO2↑
