香豆素类化合物的鉴别反应是
A．醋酐-浓硫酸反应B．异羟肟酸铁反应C．亚硝酰铁氰化钠反应D．盐酸-镁粉反应E．碘化铋钾反应
参考答案：B
Not only Jim but also Tom ________ not here. They both went to Shanghai last week. [ ]
A. are
B. were
C. is
D. was
