At about seven'o clock 正确.这个词组中的介词 at 和副词 about 不能理解为“介词和副词连用”,因为 about 是修饰 seven（数词作形容词用）的.包括 about 在内的整个时间的名词性词组作介词 at 的宾语.
At about seven'o clock 还是about at seven'o clock呢
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