Tom(人名有可能变化或Fred)was such a hardworking student that he soon came out first in the class. 英译汉
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The friend saw everything but did not say a single word.英译汉
Each time history repeats itself, the price goes up. 英译汉
The traffic jams during morning and afternoon rush hours are a headache in big cities now.英译汉
Y型通气孔作用是
A. 使助听器高频降低
B. 使助听器高频输出降低
C. 使助听器低频增加
D. 是助听器低频降低
E. 是助听器中频降低
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