对清洗剂的要求为（）
A.无毒
B.价廉
C.对工件无腐蚀
D.以上都是
参考答案：D
He said, "Don't do that again." → He _____ me _____ that again. [ ]
A. said to; to do
B. said to; don't do
C. told; don't do
D. told; not to do
WCDMA意思是（）。
A.时分多址
B.宽频码分多址
C.码分多址
D.全球移动通信系统
