Question

【题目】—Excuse me, Mr. Black, when will the concert begin?

—Not until it ____ in half an hour.

A. repairs B. is prepared C. will prepare D. will be prepared

Answer 1

【答案】B

【解析】句意“-布莱克先生，打扰一下，音乐会什么时候开始？-半小时内准备好了就开始”。本句完整句式为Not until it is prepared in half an hour will the concert begin。根据主将从现原则，用一般现在时，且It与prepare之间为被动，故选B。