单选题 I don't know whether it will rain or not, but if it______, I shall stay at home.

【正确答案】 D
【答案解析】在时间或条件状语从句中,常用一般现在时,表示将来的动作或状态。助动词do或 does,常用来代替前面所提到过的动作。例如,He gets up earlier than I do.