单项选择题

"Someone is at the door"."________"

A．What is it
B．Who is it
C．Who is he
D．Which one is it
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单项选择题
I tried very hard to persuade him to join our group but I met with a________ refusal.
A．flat
B．dull
C．blank
D．frank
单项选择题
The sellers signed the________ promising to ship the goods before the end of July.
A．contact
B．treaty
C．agreement
D．contract
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