问题
单项选择题
Is ______ 48 hours ______ the man-made satellite ______ is made in our country to orbit the planet around
A．it; that; where
B．it; when; what
C．it for; that it takes; that
D．it; that it takes; which
答案
参考答案：D
解析： 前一部分为强调句式，后一部分是定语从句，时间(48 hours)作take的宾语。