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外语
They are sweating all over. They ______ in the field.
They are sweating all over. They ______ in the field.
admin
2013-12-13
67
问题
They are sweating all over. They ______ in the field.
选项
A、may be
B、must have been working
C、could be
D、must having been working
答案
B
解析
情态动词用法题。情态动词可和一个动词的完成进行式构成谓语,表示“想必一直在,应当一直在”等意思。本句must表示肯定推测,同时根据句意,劳动一直在进行,故B项must have been working正确。
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0
专业英语四级
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