【題目】Bob promises to join in the football match ______ he has to help his parents on the farm.

A. if B. as C. unless

【答案】C

【解析】句意：鮑勃承諾參加足球比賽，除非他必須在農(nóng)場幫助他父母。if 如果；as當(dāng)；unless除非、如果不。所以選C。

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