第一个长效的抗风湿病药物是()
A.丙磺舒
B.吡罗昔康
C.阿司匹林
D.美洛昔康
E.萘普生
参考答案:B
Either the dean or the principal _____ the meeting.[ ]
a. attends
b. attend
c. are attending
d. have attended