问题
选择题
—Can you guess if they ________tomorrow?
—They will come if they ________free, I think.
A．come; will be
B．will come; will be
C．come; are
D．will come; are
答案
D
题目分析: 句意：你能猜得出是否他们明天来吗？我想，如果他们有时间会来的。if如果，主句为一般将来时，if引导的条件状语从句用一般现在时代替一般将来时；if是否，引导宾语从句，时态根据实际情况确定，故选D
