单项选择题

He （） his father's office several times this morning, but each time the line was engaged.

A．telephoned
B．dialed
C．communicated
D．recalled

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单项选择题
As the clouds drifted away an even higher peak became （） to the climbers.

A．visible
B．obvious
C．apparent
D．plain
单项选择题
The European Union countries were once worried that they would not have supplies of petroleum.（）

A．pure
B．efficient
C．potential
D．sufficient
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