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。
Themeeting_____nextweekwillbeofgreatimportance.
CharlesSmith,______wasmyformerteacher,retiredlastyear.
Ittookmeamonthtogetrid_______thecough.
Theyareeager_______abroad.
I'dliketoremindyouthatthereisno_____onthepartofsuspectstoanswerquestions.