That children meet with setbacks is a matter of necessity as they so parents don’t worry

问题补充：

That children meet with setbacks is a matter of necessity as they, so parents don’t worry about that.

A. shall; grew up

B. must； grew up

C. can; grow up

D. will; grow up

答案：

A. shall; grew up

B. must； grew up

C. can; grow up

(答案→)D. will; grow up

解析：考查情态动词和时态。 will 表示“不可避免性”。如：Boys will be boys. 句中的don’t worry说明了该句用一般现在时。