可以用类毒素预防的疾病是
A.百日咳B.伤寒C.结核病D.白喉E.破伤风
参考答案:D
It was the third time that he of the changes of the meeting. [ ]
A. had informed
B. had been informed
C. has informed
D. has been informed
We found the baby ____ on the floor.
A.slept
B.sleep
C.to sleep
D.sleeping