题目内容

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

试题分析：句意，这家公司很诚实并且保证新的产品保修期三年。这里表示给对方承诺，故用shall。
点评：情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语
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