they began to learn english when they___(be) five years old

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theybegantolearnenglishwhenthey___(be)fiveyearsoldtheybegantolearnenglishwhenthey___(be)fiveyearsold

they began to learn english when they___(be) five years old
they began to learn english when they___(be) five years old

they began to learn english when they___(be) five years old
they began to learn english when they_were__(be) five years old

were 过去是

were

were,注意句中的began