This printer is of good quality. If it _______ break down within the first year, we would repair it at our expense.
A．wouldB．shouldC．couldD．might
B
考查虛擬語氣用法。前句表示打印機質(zhì)量好，按道理起初的一年內(nèi)不可能毀壞，所以下句提出了一種將來的可能性不大的假設，由此判斷為與將來事實相反的假設，用虛擬，從句形式Be to do, 動詞過去時；should 動詞原形。故選B.
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