单项选择题

______from a distance, the island looked like a cloud.

A．Viewing
B．To view
C．Viewed
D．Being viewed
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单项选择题
Many manufacturers were accused of concentrating too heavily on cost reduction, often at the ______of the quality of their products.
A．expansion
B．exposure
C．expense
D．expectation
单项选择题
A new technique______, the yields as a whole increased by 20 percent.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
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