问题补充:
Sorry,I am too busy now.If I time,I would certainly go for an outing with you.(·湖南)
A. have had
B. had had
C. have
D. had
答案:
A. have had
B. had had
C. have
(答案→)D. had
解析:句意:对不起,我现在太忙了。如果我现在有时间的话,我会和你一起出去郊游。根据句意以及句中的now可知,此处表示对现在情况的一种假设,所以从句中谓语动词要用过去式,而主句用“could/would/should/might+动词原形”。