She will sing a song______she is asked.A.if B.unless C.for D

She will sing a song______she is asked.A.if B.unless C.for D.since 要语法!

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选A if引导的是条件状语从句,其特征是从句是一般现在时而主句是将来时.这句话的意思是：如果有人要求的话,她就会唱一首歌.unless引导的也是条件状语从句,用法和if一样,意思相当于"if not"

1年前

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