单项选择题

A．Experimental medicines.
B．Special treatment centers.
C．Innovative physical exercises.
D．Flexible work schedules.
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单项选择题
A．Mr. Wilkinson.B．Mrs. Wilkinson.C．The Wilkinsons.D．Neither of them.
A．Mr. Wilkinson.
B．Mrs. Wilkinson.
C．The Wilkinsons.
D．Neither of them.
单项选择题
A．He visited the big tower he saw on TV.B．He has visited the TV tower twice.C．He has visited the TV tower once.D．He will visit the TV tower in June.
A．He visited the big tower he saw on TV.
B．He has visited the TV tower twice.
C．He has visited the TV tower once.
D．He will visit the TV tower in June.
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