单项选择题

So little ______ about physics that the lecture was completely beyond me.

A. I knew



B. did I know
C. I had known


D. had I known
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You did tell me what to do. If only I ______ your advice.
A. take
B. took

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单项选择题
______average must a fellowship student maintain
A．How high
B．What high
C．How high an
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