---Shall I tell your best friends what happened to you yesterday?--- they ask yo
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---Shall I tell your best friends what happened to you yesterday?
---______they ask you．
A.Not if
B.Not unless
C.Not except
D.Not though
试题答案
B
考查连词。If 如果；unless 除非；except除了；though尽管。句意：我要告诉你最好的朋友你昨天发生了什么事吗？——不，除非他们问你。故选B。