1.[]Racing the clock every day is such an exhausting effort that when I actually have a few free moments,I tend to collapse.A.fall down B.fall ill C.fall out D.fall behindABCD
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参考答案：A
参考解析：句意为：每天争分夺秒的工作让人精疲力竭，以至于当我确实有些自由的时间时，我常常会倒下。collapse“塌陷”，四个选项：fall down“掉下，倒下”；fall ill“病倒”；faU out“吵闹，争吵”；fall behind“落后”；所以A项符合题意。