Thank you for sending us fresh vegetables of many kinds. You have done us a grea

Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ a great service.

A、不填；a B、the；a C、不填；不填 D、the；不填

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解析:

考查冠词的用法。第一空表示泛指，而第二空构成一个短语do sb. a great service，其意思为“给某人提供好的服务”。Service在这里为抽象名词具体化。

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Thank you for sending us fresh vegetables of many kinds. You have done us a grea