Listen!The birds _____(sing) in the tree.注意时态,be动词

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Listen!The birds _____(sing) in the tree.注意时态,be动词

Listen!The birds _____(sing) in the tree.注意时态,be动词
Listen!The birds _____(sing) in the tree.
注意时态,be动词

Listen!The birds _____(sing) in the tree.注意时态,be动词
are singing
listen听,是现在进行时的判断词,现在进行时的结构是:am/is/are + 现在分词(doing),the birds 是复数,所以用:are singing.
翻译:听:鸟们在树上正在歌唱