题型：单选题题类：常考题难易度：普通

— Hello, Sandy. This is Jack. What are you doing?
— I'm watching a match. It started at 7 p.m. and _____ on for another half an hour.

A、has been B、was C、had been D、will be

举一反三

—We often ____ English in a loud voice in the classroom.

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