一般过去时与过去进行时 — 英语填空题
题目
根据句意,用括号内动词的适当形式填空。Wilma ___ (train) hard on the track for two years before she finally ___ (win) the gold medal in 1960. Everyone knew that she ___ (overcome) many difficulties while she ___ (grow) up, so her success ___ (surprise) nobody.