问题
选择题
— What did your father do last weekend?
— He ___________ at home with us all the time.
A．stays
B．stayed
C．is staying
D．will stay
答案
答案：B
B 考查时态。根据问句中的last weekend知，用一般过去时。
搜题请搜索小程序“爱下问搜题”
— What did your father do last weekend?
— He ___________ at home with us all the time.
A．stays
B．stayed
C．is staying
D．will stay
答案：B
B 考查时态。根据问句中的last weekend知，用一般过去时。
下列叙述Ⅰ和Ⅱ均正确且有因果关系的是( )
| 选项 | 叙述Ⅰ | 叙述Ⅱ |
| A | NH4Cl为强酸弱碱盐 | 用加热法除去NaCl中的NH4Cl |
| B | 溶解度：CaCO3＜Ca(HCO3)2 | 溶解度：Na2CO3＜NaHCO3 |
| C | SiO2与HF反应 | 氢氟酸不能保存在玻璃瓶中 |
| D | Fe3+具有氧化性 | 用KSCN溶液可以鉴别Fe3+ |