设NA为阿伏加德罗常数的值,下列说法正确的是( ) ①标准状况下,11.2L以任意比例混合的氮气和氧气所含的原子数为NA ②同温同压下,体积相同的氢气和氩气所含的分子数相等 ③1L 2mol/L的氯化镁溶液中含氯离子为4NA④标准状况下22.4LH2O中分子数为NA ⑤32g O2和O3混合气体中含有原子数为2NA A . ①②③⑤ B . ③④ C . ①③④ D . ①②③④
-Did Linda see the traffic accident?
-No, no sooner ________ than it happened.
[ ]
A.had she gone
B.she had gone
C.has she gone
D.she has gone