Who has permitted you to enter the laboratory?
谁允许你进入实验室的?。
Otherwise, I would have seen Mr. Smith enter the laboratory yesterday evening.
不然，我昨天晚上就会看见史密斯先生走进实验室。
Yesterday evening I saw Mr. Smith enter the laboratory, who was said to have gone abroad, but my companion didn't.
昨天晚上我看见了那个据说已经去了国外的史密斯先生走进了实验室，但是我的同伴却没看见。
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