单项选择题

A．Only one.
B．Two.
C．Three.
D．More than three.
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单项选择题
Two Australian billionaires have been placed on the waiting list for entering space as private passengers.
A．Y
B．N
C．NG
单项选择题
A．They join the physics club.B．They ask for an extension of the deadline.C．They work on the assignment together.D．They choose an easier assignment.
A．They join the physics club.
B．They ask for an extension of the deadline.
C．They work on the assignment together.
D．They choose an easier assignment.
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