问题补充：
-- Alan’s pens?
--Yes, they’re .
A. Is this; his
B. Are these; his
C. Is this; her
D. Are these; her
答案：
A. Is this; his
(答案→)B. Are these; his
C. Is this; her
D. Are these; her
解析：句意：——这些是Alan的钢笔吗? ——是的，他们是。Pens展示名词的复数，从回答they也体现名词复数，Alan是一名男孩的名字，应当用his。故选B
