问题
选择题
If the kids stay indoors all the time and get no exercise, they _________ weak.
A．become
B．have become
C．will become
D．became
答案
答案：C
题目分析：句意：如果孩子们一直呆在室内并且得不到锻炼，他们将变得很虚弱。If引导的条件状语从句主句用一般将来时，从句用一般现在时，结合语境故选C
