2. 考研
  3. (As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flights).

(As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flights).

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问题 (As you know that) you must (check in) at least 30 minutes (before takeoff) for (most flights).
选项 A、As you know that
B、check in
C、before takeoff
D、most flights
答案A
解析 as you know that改为as让is known that。as it is known that为固定表达方式，表示“众所皆知”。
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