问题
选择题
Thanks for ______ the flowers for me. [ ]
A. water
B. waters
C. watering
D. watered
答案
答案：C
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Thanks for ______ the flowers for me. [ ]
A. water
B. waters
C. watering
D. watered
答案：C
Ca2+(aq)+2OH-(aq)，下列说法正确的是[ ]