The higher the birds flew we could see them.A. less clearlyB. the less clearlyC. more c

问题补充：

The higher the birds flew, we could see them.

A. less clearly

B. the less clearly

C. more clear

D. more clearly

答案：

A. less clearly

(答案→)B. the less clearly

C. more clear

D. more clearly

解析：考查比较级。句意：鸟飞的越高，我们越不容易看清他们。“the+比较级，the+比较级”，表示“越…越…”。结合前文The higher可知选B。