问题补充:
He is one of the students, who, I’m sure, always do best.
A. his
B. my
C. one’s
D. their
答案:
A. his
B. my
C. one’s
(答案→)D. their
解析:who always do their best是一个非限定性定语从句,修饰students,I’m sure是插入语。
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