单项选择题

A．Attention problems.
B．Participating problems.
C．Communication problems.
D．Speaking problems.
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单项选择题
A．It’s tough.B．It’s a snap.C．It’s a piece of cake.D．It’s easy.
A．It’s tough.
B．It’s a snap.
C．It’s a piece of cake.
D．It’s easy.
单项选择题
A．Only sellers.B．Only shopkeepers.C．Only buyers.D．Both buyers and sellers.
A．Only sellers.
B．Only shopkeepers.
C．Only buyers.
D．Both buyers and sellers.
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