—There is somebady at the door.Who _____ it be?—It ______ be Mr.Huang ,the driver.I asked him to come and get me this time.A.may;must notB.will;may C.can;must notD.could; must

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—There is somebady at the door.Who _____ it be?—It ______ be Mr.Huang ,the driver.I asked him to come and get me this time.A.may;must notB.will;may C.can;must notD.could; must

—There is somebady at the door.Who _____ it be?—It ______ be Mr.Huang ,the driver.I asked him to come and get me this time.A.may;must notB.will;may C.can;must notD.could; must
—There is somebady at the door.Who _____ it be?
—It ______ be Mr.Huang ,the driver.I asked him to come and get me this time.
A.may;must not
B.will;may
C.can;must not
D.could; must

—There is somebady at the door.Who _____ it be?—It ______ be Mr.Huang ,the driver.I asked him to come and get me this time.A.may;must notB.will;may C.can;must notD.could; must
选D

D.
Could 和 can 表示可能性,而 must 表示猜测中带肯定的。
问着明显不清楚来着是谁,所以用来 could; 而答者则对自己的猜测有一定把握,所以用来 must.