题干
—It’s reported that the new underground line has been completed．
—Yes, but it hasn’t been made clear it’s to be opened to traffic．
—Yes, but it hasn’t been made clear it’s to be opened to traffic．
A：that
B：who
C：what
D：whe
答案(点此获取答案解析）
D
．小明翻看了书后的答案，此方程的解是y=﹣ ，则这个常数是（ ）
用塑料袋购物； ⑧使用节能灯