How long do you think­­­Obama officially takes office in the White House? A. i

问题补充：

How long do you think­­­Obama officially takes office in the White House?

A. it will be that

B. will it be until

C. will it be when

D. it will be before

答案：

A. it will be that

B. will it be until

C. will it be when

(答案→)D. it will be before

解析：It will be +时间名词+ before意为“一段时间以后才”。do you think­为插入语，整句话用陈述语序。

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