T细胞识别抗原时所措双识别是()
A.TCR-抗原肽、TCR-MHCUⅡ类分子结合
B.Igα/Igβ
C.CD16分子
D.SmIg
E.CD3分子
参考答案:A
某数的5倍减去8等于32,设这个数为x,则可列方程为( )。
—Peter didn’t come to the meeting this morning.
— I _______ him yesterday, but I was too busy and forgot it.
A.should have told
B.should tell
C.had to tell
D.had told