----Have all the students known that our class will visit the factory this afternoon?

----Yes. Every student______about it.

A．told

B．has told

C．was told

D．tells

应对煮沸锅的二次蒸汽冷凝水进行感官品评，允许有麦汁味，不应有（）和（）。

A.醛味

B.DMS味

C.酸味

D.甜味