[单选题]Once Johnny starts painting a picture, he won't stop until it （）.

had been finished

was finished

is finished

will be finished

正确答案：C

题目解析

本题考查时态与语态。 not...until引导时间状语从句时，从句不能用将来时，主句为一般将来时，从句用一般现在时。it指代picture，与finish是被动关系，故应使用被动语态。故本题选C。

句意：一旦约翰尼开始画一幅画，他不画完是不会停下来的。

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[单选题]Once Johnny starts painting a picture, he won't stop until it （ ）.