单项选择题

International Discount Telecommunications uses ______.

A．ring-back technique
B．discounting technique
C．third-country calling technique
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单项选择题
A. claimingB. regrettingC. washingD. watchingE. drinkingF. playingG. depositingH. toasting

A. claiming
B. regretting
C. washing
D. watching
E. drinking
F. playing
G. depositing
H. toasting
单项选择题
30（）

A．army
B．number
C．group
D．handful
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