题目列表(包括答案和解析)
(1)单项选择
The research is so designed that once ________ nothing can be done to change it.
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(2)完成下面句子
过马路时一定要遵守交通规则。
________ the street, be sure to ________ the traffic rules.
单项选择
The work ________ much patience.
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A.calls at |
B.calls up |
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C.calls for |
D.calls on |
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