His business was very successful, but it was at his family’s ________.（2分） A exposure B expense C behalf D concern

The correct answer to fill in the blank in the sentence "His business was very successful, but it was at his family’s ________" is "expense." This phrase means that the success of his business came at the cost of his family life. The word "expense" in this context refers to the cost or sacrifice involved, which in this case is the family life. The other options do not fit the context of the sentence: "exposure" generally means being exposed to something, "behalf" means on behalf of someone, and "concern" means an interest or worry. The correct answer is B, "expense," as it aligns with the meaning conveyed in the sentence.1367910