---The light was on all night long. ---Yes. It seemed that Mike ________. He was the last one to leave the office.
A.
was to be blamed
B.
was to blame
C.
had been blamed
D.
should be blamed
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【简答题】维生素C(化学式为C 6 H 8 O 6 )能促进人体生长发育,增强人体对疾病的抵抗能力,试填写下列空白: (1)维生素C分子中,碳、氢、氧的原子个数比为______(最简整数比). (2)维生素C中,各元素的质量比为______(最简整数比). (3)维生素C中,碳元素的质量分数为______(结果精确到0.1%).