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题目内容
（西安石油大学大学英语二）
Never hesitate to ask about _______.( )(本题1.0分)
A、 what you don’t understand
B、 what you don’t understand
C、 that you don’t understand
D、 which you don’t understand
A、 what you don’t understand
B、 what you don’t understand
C、 that you don’t understand
D、 which you don’t understand
参考答案