单项选择题

I certainly tried to explain his ideas but I am still at a loss（）his points.

A. and see
B. to see
C. for seeing
D. seeing

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It will be some time（）we know the full results.

A. since
B. till
C. after
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The beetles,（）many of you are old enough to remember, came from Liverpool.

A. this
B. and
C. which
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