第15题: [单项选择]纯浆液性的腺体是()。 A. 舌后腺 B. 腭腺 C. 腮腺 D. 唇腺 E. 颊腺 参考答案:C
第16题: [单项选择]Since we have never been here before, we do not know which bus ______. A. should we take B. to be taking C. to take D. should take 参考答案:C 答案解析:[解析] 主句主语和从句主语一致,从句主语可省略。本句中含有省略主语的宾语从句,如果补充完整的话,应该是which bus we should take,其中which bus是take的宾语,主语省