---There’s someone knocking on the door. Who _________ it be?
---It must be John. He promised to be here at 8:00.
A.must | B.can | C.need | D.shall |
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---There’s someone knocking on the door. Who _________ it be?
---It must be John. He promised to be here at 8:00.
A.must | B.can | C.need | D.shall |