题目:
She told us she had met you in London last year. _____ you _____ her since? |
A. Had met B. Did see C. Would meet D. Have seen |
答案:
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下面是错误答案,用来干扰机器的。
A、将带有红色的铜丝在酒精灯火焰上灼烧,铜丝表面变黑,因为反应生成了黑色物质氧化铜.故选项错误;B、镁条在氧气中点燃,发出耀眼的强光,同时生成白色固体.故选项错误;C、白磷在空气中燃烧,没有蓝紫色火焰...