单项选择题

We could do nothing but ______ till he came back.

A．to wait
B．waiting
C．wait
D．waited
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单项选择题
The author believes that in a nation where free enterprise (自由企业制 ) exists , manufacturers will produce ______.
A．as much as they like
B．better quality merchandise (商品)
C．more than they are able to sell
D．both A and B
单项选择题
In regard to the production of goods in greater quantities, the author states that ______.
A．the price of the goods should drop
B．the quality of the goods should improve
C．the price and the quality should both rise
D．the quality and the price should both drop
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