第34题: [单项选择]Mary has got a full mark in the test. She ______ very hard all these days. A. will work B. may work C. must have worked D. could have worked 参考答案:C 答案解析:[试题类型] 情态动词
[试题精解] 本题考查的是情态动词的用法。will用于一般将来时,表示“将要……”,不合题意。 may表示“可能,也许”,如:It may rain today.(今天可能下