问题
选择题
15．I didn’t see your sister at the meeting. If she _______, she would have met my brother.
A．has come
B．did come
C．came
D．had come
答案
答案：D
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15．I didn’t see your sister at the meeting. If she _______, she would have met my brother.
A．has come
B．did come
C．came
D．had come
答案：D
从下列事实所引出的相应结论，正确的是
| 选项 | 实验事实 | 结论 |
| A | 等体积pH同为3的酸HA和酸HB与足量Zn反应，酸HA放出氢气多 | 酸性：HA > HB |
| B | Na2SO4溶液的pH小于Na2CO3溶液的pH | 非金属性：S > C |
| C | 电解同浓度的A2＋和B2＋硝酸盐的混合溶液，A先析出 | 金属性：A > B |
| D | 由M、N与稀硫酸构成的原电池中，M上产生大量气泡 | 金属性：M > N |