Question

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

A．had

B．have had

C．have

D．had had

Answer 1

A

A　考查动词时态。suggest在该句中意为“表明，暗示”，而非“建议”，所以宾语从句中不用虚拟语气。因为宾语从句的时间状语为about 300 years ago，故该句用一般过去时态，选A项。