真题练习

407.Must I turn off the gas after cooking?
Of course.You can never be ____ careful with that.

A.enough
B.too
C.so
D.very

408.John is very lazy.He falls ____ behind in his studies.

A.very
B.far
C.more
D.still

答案解析

407.答案是B；never,not等否定词与too连用，意为:无论…也不过分，表示肯定。

408.答案是B;此题根据语境判断。句意:约翰很懒，在学习上，他远远落后。