They are sweating all over. They ______ in the field.A、may beB、must have been w

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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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