如果在BASH中三个变量中只有一个变量为True，如何返回True？

#!/bin/bash

# 假设三个变量为 var1、var2、var3

if [[ $var1 == "True" && $var2 != "True" && $var3 != "True" ]]; then
    echo "True"
elif [[ $var1 != "True" && $var2 == "True" && $var3 != "True" ]]; then
    echo "True"
elif [[ $var1 != "True" && $var2 != "True" && $var3 == "True" ]]; then
    echo "True"
else
    echo "False"
fi