问题补充：
Where are his books? on his bed.
A. It’s
B. He’s
C. They’re
D. His books are
答案：
A. It’s
B. He’s
(答案→)C. They’re
D. His books are
解析：句意：他的书在哪里？his books为复数，所以答语应用They’re on his bed.
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