单选题Which fragment is an example of inappropriate use of assertions？ （）A assert （!（map.contains（x）））； map.add（x）；B if （x 0）{}else { assert （x==0）； }C public void aMethod（int x） { assert （x 0）； }D assert （invariantCondition（））； return retval；E switch （x） { case 1： break； case 2： creak； default： assert （x == 0）；
单选题
Which fragment is an example of inappropriate use of assertions？ （）
A
assert （!（map.contains（x）））； map.add（x）；
B
if （x > 0）{}else { assert （x==0）； }
C
public void aMethod（int x） { assert （x > 0）； }
D
assert （invariantCondition（））； return retval；
E
switch （x） { case 1： break； case 2： creak； default： assert （x == 0）；
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