1.Mary _____ an English song in her room last night.
A.was heard to sing B.was heard singing 答案为什么是B呢?
2.Mary ____ some songs in her room in the morning.我知道,此题答案是is heard to sing
人气：362 ℃ 时间：2020-05-07 15:51:59
解答
被听见正在唱
第二题用is heard to sing 用于一般情况,正常时态,
第一题 last night 特指昨晚.
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