—Is Lucy knocking at the door? —No. It _
题型:选择题
问题:
—Is Lucy knocking at the door?
—No. It ______ be Lucy. She is in Japan now. [ ]
A. needn't
B. mustn't
C. can't
D. shouldn't
—Is Lucy knocking at the door?
—No. It ______ be Lucy. She is in Japan now. [ ]
A. needn't
B. mustn't
C. can't
D. shouldn't