问题
选择题
| — Why did he come back? — It is _____ he forgot to take his umbrella with him. |
A. for B. as C. since D. because |
答案
答案：D
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| — Why did he come back? — It is _____ he forgot to take his umbrella with him. |
A. for B. as C. since D. because |
答案：D