问题标题：
三道高中英语单选.几道英语单选1.InChina,students____howtocleanroomsincetheyarelittle.a.weretaghtb.taughtc.havebeentaught2.oneactivityofthefestiveistheapplehunt_____studenttrytofindthehiddenapples.which?where
问题描述：
三道高中英语单选.
几道英语单选
1.InChina,students____howtocleanroomsincetheyarelittle.
a.weretaghtb.taughtc.havebeentaught
2.oneactivityofthefestiveistheapplehunt_____studenttrytofindthehiddenapples.
which?where?whose?
3.It'suncertain____thecitywillbecomesafewithbloodingconflicts.
whether?that?what?
孙忠良回答：
1.选C因为有since所以应该用完成时,排除了A、B2.
2.which因为这个所填的词是要来修饰前面的hunt
3.that固定的句型it'sadj.that……
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