问答题
The child would not stop crying__________(不论他们百般努力尝试)．
【参考答案】
however hard they tried
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单项选择题
【B2】（）
A．immune
B．used
C．accustomed
D．neutral -
填空题
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单项选择题
Arctic explorers may catch colds when________.
A．they are working in the isolated arctic regions
B．they are writing reports in terribly cold weather
C．they are free from work in the isolated arctic regions
D．they are coming into contact again with the outside world
