无菌包在未污染的情况下可保存
A.7~14天B.7天C.10天D.24小时E.4小时
参考答案:B
I’ve read all the books ______you gave me.
A.who
B.whose
C.whom
D.that
He has only _________ friends , so he often plays by himself.[ ]
A. a few
B. few
C. a little
D. little