问题
选择题
I'm still working the problem. But I think I can work it soon. [ ]
A. on; on
B. on; out
C. out; at
D. at; at
答案
答案:B
I'm still working the problem. But I think I can work it soon. [ ]
A. on; on
B. on; out
C. out; at
D. at; at
答案:B