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。
Thebookfairhasreceivedapositive________fromreaders.
_______foryourlaziness，youcouldhavefinishedtheassignmentbynow.
Wateriscomposed_______hydrogenandoxygen.
Decisiononwhetherthemessageisrightorwrongshouldatleastcomeafter_____whatthemessageis.
支持代孕的理由有
