问题
选择题
You can't imagine what difficulty we had _____ home in the snowstorm.[ ]
A. walked
B. walk
C. to walk
D. walking
答案
答案：D
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You can't imagine what difficulty we had _____ home in the snowstorm.[ ]
A. walked
B. walk
C. to walk
D. walking
答案：D
如下图所示装置中，观察到电流计指针偏转，M棒变粗，N棒变细，由此判断下表中所列M、N、P物质，其中可以成立的是
M | N | P | |
| A. | 锌 | 铜 | 稀硫酸溶液 |
| B. | 铜 | 铁 | 稀盐酸 |
| C. | 银 | 锌 | 硝酸银溶液 |
| D. | 锌 | 铁 | 硝酸铁溶液 |