I was doing my homework ______ my mother was cooking in the kitchen.
A. after B. while
C. if D. until
答案
B。考查连词辨析。句意: 妈妈在厨房做饭的时候, 我正在做作业。while引导时间状语从句, 两个动作同时进行, 主从句都用过去进行时。故选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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