问题
选择题
Now we are leaving the business district and __________ the harbour.[ ]
A. approach
B. approach to
C. approaching
D. approaching to
答案
答案：C
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Now we are leaving the business district and __________ the harbour.[ ]
A. approach
B. approach to
C. approaching
D. approaching to
答案：C
HBr+HBrO，当加入AgNO3溶液后，溶液颜色变浅。