Mary waited here (for three hours).对括号内提问 ————— ————— ————— Mary _____ here?

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Mary waited here (for three hours).对括号内提问 ————— ————— ————— Mary _____ here?

Mary waited here (for three hours).对括号内提问 ————— ————— ————— Mary _____ here?
Mary waited here (for three hours).对括号内提问 ————— ————— ————— Mary _____ here?

Mary waited here (for three hours).对括号内提问 ————— ————— ————— Mary _____ here?
How long did Mary wait here

How many hours did wait
有不会的可以再问我

——How——— ——long——— ——did——— Mary _wait____ here?

Mary waited here (for three hours).对括号内提问 How long did Mary wait here?