It rained hard yesterday, ______ prevented me from going to the park.
A、thatB
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。
Thenewdiscovery_______beofgreatservicetomankind.
Theyareeager_______abroad.
Studentsshould_____theirowninterestsaswellasdotheirschoolwork.
Notuntilrecently_____thatThompsonhadbentellingthetruthallalong.
Nosoonerhadwereachedhome________aviolentstormbrokeout.
