There are a number of different occasions when you might be ________ to make a speech. Therefore, you need to practice how to speak to a large audience. A、 calling upon B、 called upon C、 calling down D、 called down

There are a number of different occasions when you might be ________ to make a speech. Therefore, you need to practice how to speak to a large audience.
A、
calling upon

B、
called upon

C、
calling down

D、
called down

出自：河北农业大学大学英语Ⅳ

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