Itrainedhardyesterday,______preventedmefromgoingtothepark.
B
本句话为非限制性定语从句，所以不能用 that 来引导。在本题中， prevent 由于是行为动词，所以正确选项应为 B。
Theboycomplained_______apaininhisstomach.
Hewouldhavegivenyoumorehelp,ifhe________sobusy.
Ittookmeamonthtogetrid_______thecough.
The meeting _____ next week will be of great importance.
The central theatre has a seating ________ of more than 3, 000 people.