当在使用中对水泥质量有怀疑或水泥出厂超过（）个月时，应进行复验，并按复验结果使用。

A.3

B.4

C.5

D.6

— I need something for cutting the paper. 

— Oh, you want a knife? OK, I'll get _____ for you. [ ]

A. it

B. that

C. this

D. one