Miss Brown has taught physics for (20) years.(对括号部分提问)

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Miss Brown has taught physics for (20) years.(对括号部分提问)

Miss Brown has taught physics for (20) years.(对括号部分提问)
Miss Brown has taught physics for (20) years.(对括号部分提问)

Miss Brown has taught physics for (20) years.(对括号部分提问)
How many years has Miss Brown taught physics for?
如果是对for 20 years提问,就是:
How long has Miss Brown taught physics?