—Will you answer the telephone? It be your mother
—Sorry, I . I'm busy [ ]
A.can ; mustn't
B.will ; can't
C.may ; can't
D.need ; will
答案:C
—Will you answer the telephone? It be your mother
—Sorry, I . I'm busy [ ]
A.can ; mustn't
B.will ; can't
C.may ; can't
D.need ; will
答案:C