“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
A.must; could | B.may; might |
C.need; must | D.could; need |
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“Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”
A.must; could | B.may; might |
C.need; must | D.could; need |