单项选择题

A．Husband and wife.
B．Receptionist and customer.
C．Boss and employee.
D．Waiter and guest.
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单项选择题
A．being stoppedB．were fixingC．were fixedD．fixed
A．being stopped
B．were fixing
C．were fixed
D．fixed
单项选择题
A．collapsingB．fallingC．slippingD．dropping
A．collapsing
B．falling
C．slipping
D．dropping
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