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
The discipline （） hard, but it was wholesome.
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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
Sometimes we don't overlook the things that （）.
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