I tried calling you, your phone was out of service.
A．and B．but C．so D．or
答案
B
【解析】
句意：我试着给你打电话，但你的电话不在服务区。
A. and和，而且；B. but但是；C. so因此；D. or或者，否则。结合语境可知，前后句表示转折关系，故答案为B。
Ted has ten soccer balls, _____he doesn't play them．
A．and B．with C．but D．of
Don’t fight in class __________don’t run in the hallways．
A．or B．so C．but D．and
Susan is good-looking，__________she’s a little hit short．
A．so B．with C．or D．but
Jane, please turn off the lights ______ you leave the classroom.
A．after B．before C．until D．but
--Hurry up! The bus is coming．
--Wait a minute．Don't cross the street ________ the traffic lights are green．
A．until B．after C．while D．since
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