单选题：They l；vill not start the project until the board chairman__

题目分类：英语三级A级
题目类型：单选题
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题目内容：

They l；vill not start the project until the board chairman___________back from South Africa． A．will come
B．is coming
C．came
D．comes

参考答案：

答案解析：

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当栏杆在基坑四周固定时，可采用钢管打人地面（　　）cm深，钢管离基坑边口的距离不应小于50 cm。A．20～50 B．30～50 C．20～80 D．30～80

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简述整装易燃液体运输危险辨识的内容。

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分类：英语三级A级题型：单选题