问题
选择题
Henry has come in his raincoat and boots, ________ for rain.
[ ]
A. prepared
B. preparing
C. to prepare
D. prepares
答案
答案：A
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Henry has come in his raincoat and boots, ________ for rain.
[ ]
A. prepared
B. preparing
C. to prepare
D. prepares
答案：A
可知 [ ]
叫做速度变化率即为加速度