A: That’s all right
B: No, thank
C: That’s right
D: Of course
General secretary Xi Jinping urged Washington ________ concrete measures to loosen hightech export controls to China.
None of my friends ______at 10, so I realized it was a trick and felt really embarrassed.
在生物组织的可溶性还原糖.脂肪.蛋白质的鉴定实验中,对材料选择错误的是( )