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The company is quite honest and guarantees the new product ______ be under warranty for three years.
A．shouldB．shallC．willD．can
B

試題分析：句意，這家公司很誠實并且保證新的產(chǎn)品保修期三年。這里表示給對方承諾，故用shall。
點評：情態(tài)動詞有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。情態(tài)動詞無人稱和數(shù)的變化；不能單獨使用，必須與其后的動詞原形構成謂語
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