All too _____ it was time to go back to school after the glorious summer holidays.
A.often
B.fast
C.soon
D.late
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C解析 all too实在太......，all too soon意为太快了，带有惋惜的意味，如：Tom had snatched a short holiday from his work to e here. He said it ended all too soon.（汤姆趁工作之暇匆匆来此渡一短假，他说，假期过得太快了。）