帮忙讲解两道高一英语单选题 谢谢
As a result of destroying the forests , a large _____ of desert _____ coveredthe land.
A.number；has B.quantity；has C.number；have D.quantity；have
请问这道题为什么选B
Don't leave matches or cigarettes on the table within ______of little children.
A.hand B.reach C.space D.distance
这道题为什么选B
There were twenty _____ in the group.
A.after all B.all over C.at all D.in all
这道题为什么选D 请您帮忙稍详细的讲解一下 十分感谢
不好意思 是三道能在稍微详细一点么 谢谢