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第1题

It was about 150 years ago ( ) Dalton put forward the important idea. A.when B.that C.at which D.
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第2题

( ) he was asked to start on another journey. A.No sooner he had arrived home than B.No sooner had he arrive
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第3题

( ) who caused you to serve dinner an hour later than usual? A.Was he B.Did he C.Has he D.Was it
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第4题

( ) evidence that the puma at large has come from a private collector. A.If being B.It is C.There is
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