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This printer is of good quality. If it ________ break down within the first year, we would repair it at our expense.

A.would 

B.should

C.could 

D.might

B解析:should此處是表示與將來事實相反的虛擬語氣。should此處意為“萬一”。句意:這臺打印機質量很好。如果一年之內出故障的話,我們免費維修。

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