"What can I do for you?" "If you ______ see Mr.Li,tell him I‘ve got his letter and I‘ll write to him soon.A.mustB.may notC.won‘tD.should
问题描述：
"What can I do for you?" "If you ______ see Mr.Li,tell him I‘ve got his letter and I‘ll write to him soon.
A.must
B.may not
C.won‘t
D.should
答