单项选择题

Both he and I ______ hard at Chinese.

A． am working
B． is working
C． are working
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单项选择题
—Must I dean the room now—No, you ______.
A． can't
B． mustn't
C． needn't
单项选择题
—______ house is that—It's mine.
A． Who
B． Whom
C． Whose
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