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50. Since it's raining hard now we had better to put off our sports meet till next week.
解析：因为现在在下大雨，我们不得不把我们的运动会推迟到下周。
答案选择C，因为had better后面需要跟动词原形，但是had better后面有个to，所以这里不能用had better，可以改为have。正确的句子应该是Since it's raining hard now we have to put off our sports meet till next week.
