问题

genetic similarities suggested they all ________ a single, common ancestor about 300 years ago.

A:had
B:have had
C:have
D:had had

正确答案是：

同类题型

I don’t know__________ the bag is. – Tom’s.

His first baby was born soon after he got married, which seemed to have ___his sense of responsibility.

Monitor — I’m not monitor ofour class I __ with the teacher until the monitor is elected

If you happen to know the answer, please raise your hand.

For all these years I have been working for others. I’m hoping I’ll my own business someday.[ ]