题干
here yesterday, he would attend the lecture with us today.
A：Were he
B：If he were
C：Had he bee
D：Should he be
答案(点此获取答案解析）
C
A：Were he
B：If he were
C：Had he bee
D：Should he be
气a L，完全燃烧后生成b L CO2和c L水蒸气（温度、压强与原混合气相同），若a∶b∶c＝3∶6∶4，则下列叙述中正确的是
