How long do you think Obama officially takes office in the White
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How long do you think_________Obama 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
试题答案
D
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。