问题
选择题
The earth could be younger and took more than three times longer to form than _______ thought, according to a new study.
A．favorably
B．deliberately
C．practically
D．previously
答案
答案：D
按新研究，地球比以前认为可能更年轻，形成多花了三倍多时间。A支持地有利地B有意地C实用实践地D先前地。