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【多选题】
哪些选项关于循环结构的描述是正确的( )A.
循环是程序根据条件判断结果反复执行的一种运行方式
B.
条件循环和遍历循环结构都是基本的循环结构
C.
循环是一种程序的基本控制结构
D.
死循环无法退出,没有任何作用
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反馈参考答案：
举一反三
【单选题】It ______ for two hours and the ground is too wet to play on, so the match has been put off.
A.
has been raining
B.
was raining
C.
had been raining
D.
has rained
【单选题】It’s raining outside! Put on your raincoat, ________ you’ll get wet.
A.
and
B.
but
C.
or
D.
though
【单选题】As the wood us wet, it won’t ___.
A.
be caught fire
B.
catch fire
C.
on fire
D.
put on fire
【单选题】............... your towel over a soft surface like your bed, put your baby on it, undress your new born baby, and wrap your baby in a towel.
A.
Lie
B.
laying
C.
lay
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