56 [填空题,0.7分] Fill in the blanks with the appropriate form of the verb or verb phrase given:If it __________ (be not) for their support , we would be in a very difficult position.

56
[填空题,0.7分] Fill in the blanks with the appropriate form of the verb or verb phrase given:If it __________ (be not) for their support , we would be in a very difficult position.

出自：当代英语语法概论

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