酸性气中烃含量过高会引起（）。
A.硫磺回收装置生产异常
B.干气带烃
C.干气质量不合格
D.液态烃C5不合格
参考答案：A
Are you good at your _____ at school? [ ]
A. school work
B. school works
C. schoolwork
D. schoolworks
Had he studied harder, he______the final exams.
A．would pass
B．could pass
C．had passed
D．would have passed
