问题
选择题
The company trouble early on,when a major order was cancelled. [ ]
A. made into
B. knocked into
C. ran into
D. dropped into
答案
答案：C
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The company trouble early on,when a major order was cancelled. [ ]
A. made into
B. knocked into
C. ran into
D. dropped into
答案：C
2Hg+O2↑
Cu+CO2