is our duty good service to customers.A、That, to giveB、This, giving

游客2025-07-04 13

问题 ______is our duty______ good service to customers.

选项 A、That, to give
B、This, giving
C、It, to give

答案 C

解析考查it的用法。it可作为先行词，作句子的形式主语或形式宾语。在本句中，作不定式的形式主语。因此，C是正确选项。

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______is our duty______ good service to customers.A、That, to giveB、This, giving