眼镜架规格尺寸为54-14-140，该表示方法为（）。
A.国际法
B.方框法
C.基准线法
D.统计法
参考答案：C
— Is Jack on duty today?
— It ____ be him; it's his turn tomorrow. [ ]
A. must's
B. won't
C. can't
D. needn't
碳
