Tom my good friends Jim and Mike.A. This isB. they areC. that isD. these are

问题补充：

Tom, my good friends, Jim and Mike.

A. This is

B. they are

C. that is

D. these are

答案：

A. This is

B. they are

C. that is

(答案→)D. these are

解析：句意：汤姆，他们是我的好朋友，吉姆和麦克。在对别人介绍朋友的时候，this表示这位是，these 表示他们是，是复数的概念,that表示那位是，而不直接用人称代词的主格形式。故选D.