22. For the following function foo, which statement is true?
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(A) If n＞1, the returned value of function foo must be even.
(B) The time complexity of function foo is O(n?).
(C) For any integer n＞=1, function foo calculates the value of 2-1 i.
(D) The value returned by foo(2.8) is 3.
(E) All the above statements are true.

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統計： A(1), B(1), C(1), D(0), E(0) #2826217