【单选题】------I have just had my watch repaired. ------How much did they ____ for that?
【单选题】--- Oh, it’s you! I ___________ you. ---- I have just had my hair cut, and I am wearing new glasses.
【单选题】某化合物的相对分子质量 M r =72, 红外光谱指出 , 该化合物含羰基 , 则该化合物可能的 分子式为( )
D.
C 4 H 8 O 或者 C 3 H 4 O 2
【单选题】某化合物的相对分子质量 M r =72,红外光谱指出,该化合物含羰基,则该化合物可能的分子式为 ( )
【单选题】—I have just had my watch repaired. —How much did they ________ for that? [ ]
【单选题】— I have just had my watch repaired. —How much did they ______ you?