Students in our school___know shoutingis not allowed in the library.A.can B.may C.must D.need

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Students in our school___know shoutingis not allowed in the library.A.can         B.may         C.must         D.need

Students in our school___know shoutingis not allowed in the library.A.can B.may C.must D.need
Students in our school___know shoutingis not allowed in the library.
A.can B.may C.must D.need

Students in our school___know shoutingis not allowed in the library.A.can B.may C.must D.need
C
表示‘命令’ 必须(知道)