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The discipline （） hard, but it was wholesome.
The discipline （） hard, but it was wholesome.
A.may be
B.may has been
C.may have been
D.may have being
正确答案：may have been
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英语语法
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Sometimes we don't overlook the things that （）.
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Modals help main words to form finite verb phrases, in which only one modal can be used, and it is always the first word in the phrase.