题目

____ that caused him to serve dinner an hour later than usual.     A. It was we being late                 B. It was our being late     C. It was we were too late              D. It was because we were late 答案：B下列物质能导电的是（ ）①固体食盐 ②溴水 ③CuSO4·5H2O ④液溴⑤蔗糖 ⑥氯化氢气体 ⑦盐酸 ⑧液态氯化氢A.①④⑤B.②⑦C.⑤⑥⑧D.④⑧