1987年美国风湿病协会修订的类风湿关节炎的诊断标准有几项()
A.5项
B.6项
C.7项
D.8项
E.10项
参考答案:C
The field research will take Luffy and Steven about two weeks; it will be a long time _______ we _______ again.
A.before; met
B.since; meet
C.before; meet
D.since; met
任何文法的任何句子的句柄都是唯一的。