—Whose bike is this? —It must belong. I have seen him riding it.A. JohnB. JohnsC. to John

问题补充：

—Whose bike is this? —It must belong. I have seen him riding it.

A. John

B. Johns

C. to John

D. to John’s

答案：

A. John

B. Johns

(答案→)C. to John

D. to John’s

解析：句意：这是谁的自行车？它一定属于约翰。我看见过他骑着它。Belong to sb属于某人，是一个固定用法，所以选C。