问题
选择题
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
答案
答案：D
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。