____thecenterofourplanetarysystemwasconsideredasheresybythechurchintheMiddleAges.
B
【句意】 太阳系的中心是太阳而不是地球这一事实被中世纪的教会认为是异端邪说。
【难点】 That引导主语从句，全句的谓语是was considered.
One of the requirements for a fire is that the material ____to its burning temperature.
It’simportant_____aforeignlanguage
I ’d like to have a long holiday, but I’m really too busy to _____ the time.