问题
选择题
Alice is one of the students who I am sure always best in most difficult situations.
A．do her
B．do their
C．does her
D．does their
答案
答案：B
考查定语从句的主谓一致，定语从句的谓语和先行词一致，这题定语从句的I am sure是插入语，先行词是one of the students，说明努力的学生很多，爱丽丝是其中一个，谓语用复数，用their代替the students。选B。