细菌的荚膜多糖
A．半抗原 B．胸腺非依赖性抗原 C．自身抗原 D．同种异型抗原 E．超抗原
参考答案：B
He did not regret saying what he did but felt that he _____ it differently. [ ]
A. could express
B. would express
C. could have expressed
D. must have expressed
点灯人生活中喜欢（）。
A.熄灭路灯
B.看星星
C.睡觉
