几道英语单选题,求分析

题目

几道英语单选题,求分析
1.the old woman treated me very well as if i _____her own child A.were B.am Cshould be D.must be 2 .i think it was ____ surprise that he finished the work without _____ rest 填a 或the或不添 3.drivers must be careful ,for a single mistake in driving can _____them their lives Alose Btake Cspend Dcost
第三题怎么都不一样啊

答案

1.a 虚拟语气 be动词一律用were
2.a /不填
3.a