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    【题目】The desk that ____clean so I could do homework was always surrounded with bowls of bad milk, old magazines and so on.

    A.may have been

    B. would have been

    C. must have been

    D. should have been

    【答案】D

    【解析】考查情态动词和虚拟语气。根据that从句可知，本题主句的谓语是was always surrounded。主句陈述过去的客观事实，从句用与过去相反的虚拟语气，为“本应该”所以选择D。本题题意：那个桌子本来应该被收拾得干干净净，我在上面写作业的，它却堆满了过期牛奶的瓶子和旧杂志等。故D正确。

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