Kate and Alice are good friendsoften help each other.A. TheyB. ThemC. TheirD. Theirs

问题补充：

Kate and Alice are good friends. often help each other.

A. They

B. Them

C. Their

D. Theirs

答案：

(答案→)A. They

B. Them

C. Their

D. Theirs

解析：句意：凯特和爱丽丝是好朋友，她们经常互相帮助。根据句意此空应用人称代词，又因此空在句中作主语，所以用主格they，因此选A。