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问题 改错题
单句改错(每句均有一处错误)。
1. My uncle has become a Party member for ten years.
2. Have you gone to the Great Wall?
3. How long has your brother bought the book?
4. —Who likes maths in your class?
    —None.
5. Mr.Zhang reached two hours ago.

_____
_____
_____

_____
_____

答案

1. become→been

2. gone→been

3. bought→had

4. None→No one/Nobody

5. reached→arrived

多项选择题

特高压输电有哪些社会、经济效益（）

A.提高电网安全性和可靠性

B.减少走廊回路数，节约大量土地资源

C.实现大规模跨区互联，获得显著的经济效益

D.减轻铁路煤炭运输压力
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多项选择题

从网络角度讲，关键之关键是要解决好（）这些问题。

A.加速

B.接入

C.互联

D.智能
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