It rained hard yesterday, ______ prevented me from going to the park.
正确答案： B
本题解析：
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。
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He would have given you more help, if he ________ so busy.
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It is important to ________ your skin from the harmful strong sunlight.
He was ______ to withdraw from running for the presidency.
The two girls competed with each other ______ the highest mark.
If the operation ________ carefully prepared, it would not have been successful.
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