单项选择题

The noise was so faint that you had to______your ears to hear it.

A. stir
B. strain
C. stride
D. strengthen
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The small machine for______coffee beans is quite expensive.
A. breaking
B. grinding
C. splitting
D. crashing
单项选择题
______a fine day, the Stones decided to go to the beach for a picnic.
A. What
B. Being
C. Having been
D. It being
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