英语选择题let's settle this matter
Let's settle this matter____
A.once and for all
B.once for all
C.once all
D.once at all
我选的是B,请说明错误原因和正确答案理由.
Smoking is so harmful to personal health that it kills ____ people each year than automobile accidents.
A.seven more times
B.seven times more
C.over seven times
D.seven times
我选的是A，要求同上。