单项选择题

All the parts of these washing machines are（）, so that it is very convenient tO replace them.

A. normalized
B. modernized
C. mechanized
D. standardized

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单项选择题
The retired engineer plunked down $50,100 in cash for a midsize Mercedes as a present for his wife—a purchase（）with money made in the stock the week before.

A. paid off
B. paid through
C. paid out
D. paid for
单项选择题
The new computer virus（）,the system was restored to its normal operation.

A.having removed
B.being removed
C.had been removed
D.was removed
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