问题

wo sons ______ in Afghanistan, John and SusieMayes are working extra hard this year to make sure their grandchildren have agreat Christmas.

A:to serve
B:serving
C:having served
D:served

正确答案是：

同类题型

I can’t remember when exactly the Robinsons leftcity.I only remember it was Monday.

You ____ television．Why not do something more active?

__________ the kids have left home, we’ve got a lot of extra space

170 Believe in yourself and be _____ youare

下列加点字的用法和意义相同的一组是