问在if语句中，linecache不工作？

EN

import linecache
for i in range (4):
    file = open("looptestofreceivingquestions.txt", "r")
    lineq = i+1
    print(linecache.getline("looptestofreceivingquestions.txt", lineq))#gets line q depending on iteration
    question = input("what is the answer?")
    linea = i+5
    answer = linecache.getline("looptestofreceivinganswers.txt", linea)
    file.close()
    print(question)
    print(answer)
    if question == answer:
        print("correct")
    elif question != answer:
        print("wrong")