科目：高中英语 来源： 题型：单选题
Junk messaging has been a headache for years, ＿＿the action taken by the authori-ties has not yet produced the results expected
| A．as | B．but | C．so | D．before |
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科目：高中英语 来源： 题型：单选题
—How come you are always staring at me this morning?
—You look stupid! The way you wear is________ annoys me most.
| A．which | B．where | C．how | D．what |
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科目：高中英语 来源： 题型：单选题
________ astronauts cannot go to a baseball game or a movie in orbit , there are many familiar activities that they can still enjoy.
| A．While | B．Since | C．Before | D．Unless |
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科目：高中英语 来源： 题型：单选题
Rock-climbing is a breathtaking activity, very popular nationwide among young people, ______ cooperation as well as courage plays an important role.
| A．who | B．which | C．where | D．of which |
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科目：高中英语 来源： 题型：单选题
We'll carry on the work ______ we can get the machines we need. After all, it's the determination that really counts.
| A．unless | B．before | C．whether | D．while |
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科目：高中英语 来源： 题型：单选题
_____ leaves the room last ought to turn off the lights.
| A．Anyone | B．The person | C．Whoever | D．Who |
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