题目内容
The reason for his success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |
B
解析试题分析：考查表语从句：句意：他成功的原因是他工作很努力。主语是the reason的时候，表语从句用that连接。选B。
考点：考查表语从句
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| A．It; that | B．What; what |
| C．It ; what | D．What; that |
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| A．As | B．When |
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| A．as soon as | B．unless |
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