摘要：---Who it be that is knocking at the door? ---It be Father, but I'm not sure. A. can, must B. must, can C. can, may D. may, must
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——Who it be that is knocking at the door?
——It be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
——Who it be that is knocking at the door?
——It be Father, but I’m not sure.
A．can; must B．can; may C．must; can D．may; must
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