基槽开挖后，必须经（）最后检查签证，方可隐蔽。
A．业主代表
B．施工单位负责人
C．监理工程师
D．质量监督站监督员
参考答案：C
某学生在量取液体时，俯视刻度进行读数，读得体积为36mL，则他所量的液体的实际（ ）
A．大于36mL
B．小于36mL
C．等于36mL
D．都有可能
—Why is the classroom so dirty?
—Sorry , sir. It ____ yesterday. We forgot to do it.[ ]
A. doesn't clean
B. didn't clean
C. isn't cleaned
D. wasn't cleaned
