单项选择题

21（）

A．used
B．using
C．to use
D．use

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热门试题

单项选择题

Dawson was dissatisfied with soft iron pitons because （）

A．they were too soft to bear the climber’s weight
B．they were the only pitons he could afford to buy
C．they coul not last long
D．they were made of iron

单项选择题

What does the work pest in the second sentence of the first paragraph mean（）

A．Harmful thing.
B．Insignificant thing.
C．Troublesome thing
D．Trivial thing