Steve was busy clearing the cups and dishes from the table ________ others were playing.
| A．until | B．if |
| C．since | D．while |
科目：高中英語 來源： 題型：單選題
_______ I went to the South Lake in Hanzhong, I was deeply impressed with its beautiful scenery.
| A．For the first time | B．The first time |
| C．At first | D．It was the first time |
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科目：高中英語 來源： 題型：單選題
Mark needs to learn Chinese________his company is opening a branch in Beijing.
(2013·山東，26)
| A．unless | B．until |
| C．a(chǎn)lthough | D．since |
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科目：高中英語 來源： 題型：單選題
________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
| A．Even if | B．As far as |
| C．If only | D．So long as |
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科目：高中英語 來源： 題型：單選題
It will be another 50 years ______ our country is expected to reach the level of a medium developed country.
| A．since | B．before |
| C．that | D．when |
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科目：高中英語 來源： 題型：單選題
—I wonder how much you charge for your services.
—The first two are free ________ the third costs $30.
| A．while | B．until |
| C．when | D．before |
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科目：高中英語 來源： 題型：單選題
________ H7N9 is a deadly virus, it is still safe to eat thoroughlycooked chicken.
| A．Until | B．While |
| C．If | D．Since |
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科目：高中英語 來源： 題型：單選題
He always keeps silent when others are talking excitedly, ________ inwardly he is a man full of passion.
| A．a(chǎn)nd | B．for |
| C．so | D．yet |
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科目：高中英語 來源： 題型：單選題
It remains to be seen ________ this plan is practical enough to keep the project going.
| A．whether | B．how |
| C．where | D．when |
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