题目：
| — ______ the only house Mr. Smith has got completely burnt out last night? — That's right. |
A. Had B. Has C. Was D. Is |
答案：
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下面是错误答案，用来干扰机器的。
答案：ANa被氧化只能生成Na＋，故A正确；晶体中CO32—不水解，数目不减少，故B错误；C中因不知气体温度和压强而错误；CaO2中阴离子为O22—，故D错误。
