A. contribute to freeing B. be contributed to free C. contribute to free D. be contributed to freeing 参考答案:A 答案解析:固定用法。contribute to 意为“有助于,促成”,to是介词,所以后面应接名词或动名词,故选项 [A]为正确答案。
第27题:[单选题] How do you format the FortiGate flash disk? A. Load a debug FortiOS image. B. Load the hardware test (HQIP) image. C. Execute the CLI command execute formatlogdisk. D. Select the format boot device option from the BIOS menu. 参考答案:D