_____ he had not been ill , Tom would have won the race.A．UnlessB．AsC．IfD．Until-英语

题目简介

_____ he had not been ill , Tom would have won the race.

A．Unless

B．As

C．If

D．Until

题型：单选题难度：偏易来源：不详

题意：如果汤姆没有生病，他就会赢得那场赛跑。if引导虚拟的条件状语从句。