______ scientists have learned a lot about the universe, there is much we still don't know.
A. Once B. Since
C. Though D. Unless
閱讀快車系列答案科目：高中英語 來源：2016年高考一輪復習新人教版必修2特殊句式練習英語試卷（解析版） 題型：單項填空
I've tried very hard to improve my English. But by no means________with my progress.
A. the teacher is not satisfied
B. is the teacher not satisfied
C. the teacher is satisfied
D. is the teacher satisfied
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科目：高中英語 來源：2016年高考一輪復習新人教版必修1名詞性從句（2）練習英語試卷（解析版） 題型：單項填空
If you swim in a river or lake, be sure to investigate is below the water surface. Often there are rocks or branched hidden in the water.
A. what B. who
C. that D. whoever
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科目：高中英語 來源：2016年高考一輪復習新人教版必修4動詞時態語態（2）練習英語試卷（解析版） 題型：語法填空
One day, Nick invited his friends to supper. He was cooking some delicious food in the kitchen. Suddenly, he ______ (find) that he has run out of salt.
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科目：高中英語 來源：2016年高考一輪復習新人教版必修3狀語從句練習英語試卷（解析版） 題型：單項填空
We need to get to the root of the problem______ we can solve it.
A. while B. after
C. before D. as
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科目：高中英語 來源：2016年高考一輪復習新人教版必修3 動詞時態語態（1）練習英語試卷（解析版） 題型：單項填空
—Has James arrived at the hotel?
—No, he ______ by fans for photographs at the airport.
A. has surrounded B. would surround
C. was surrounded D. is being surrounded
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科目：高中英語 來源：2016年高考一輪復習新人教版必修3 動詞時態語態（1）練習英語試卷（解析版） 題型：單項填空
Mary really hard on his book and thinks he’ll have finished it by Friday.
A. worked B. has been working
C. had worked D. has worked
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科目：高中英語 來源：2016年高考一輪復習新人教版必修2語法專題復習 定語從句練習英語試卷（解析版） 題型：單項填空
— Do you know __________ they got to know each other?
— It was last year ________ they both taught English in China.
A． when was it that; when
B． when it was that; that
C． when it was that; when
D． when was it that; that
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