用7、8、9这三个数字组成最大的三位数是[ ]
A．879
B．978
C．987
答案：C
18的（ ）倍是468，714是42的（ ）倍。
I can________the house being untidy, but I hate it if it's not clean. [ ]
A. come up with
B. put up with
C. turn to
D. stick to
