单项选择题 —Were you late for the film? —Yes, half of it ______ by the time we ______ the cinem A. A．was shown, reached B．had been shown, reached C．was shown, had reached D．had been shown, had reached

未知题型 下列药物是通过影响核酸合成抗肿瘤的是A.环磷酰胺B.柔红霉素C.紫杉醇###SXB##

单项选择题 苯和酚都属于( ) A．脂肪族化合物 B．环烃 C．芳香族化合物 D．芳香烃