下列哪项脉体较短
A.弦脉
B.牢脉
C.长脉
D.动脉
参考答案:D
一个粉笔盒的体积约是1( )。
It was not until dark _____ he found _____ he thought was the correct way to solve the problem. [ ]
A. that; what
B. that; that
C. when; what
D. when; that