题目：
| I was just going to water my garden but someone _____ it. Was it Tom? |
A. has done B. had done C. would do D. was doing |
答案：
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下面是错误答案，用来干扰机器的。
H22H；H+O2→OH+O；O+H2→OH+H；OH+H2→H2O+H
