几道语法题,请详解

题目

几道语法题,请详解
1.we were all surprised when he made it clear that he ——office soon
a leaves b would leave c left d had left
2.she has sacrificed so much ——— support the family
a because of b because c for d in order to
（选d 的原因是他是词组 而for是介词,后面必须加名词是吗）
3.it is not——to ask her that question
a suit b suits c fits d fit
4 parents are encourage to__ computers for their children
a get b purchase c gain d buy
3题 it 不是第三单吗，为何不用fits

答案

1：b 根据后面的时间状语soon来判断,宾语从句应该用将来时,而主句中的谓语动词为一般过去时,所以宾语从句的时态为过去将来时.翻译：当他表明他马上就要离开办公室时,我们全部震惊了.2：d,a和c后面都接名词或者动名词...