[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.Many countries have a Mother's Day，（） they don't always fall on the second Sunday in May.

when

though

once

正确答案：B

题目解析

when意为当......时候；though意为尽管；as意为正如，当......时候；once意为一......就......分析句意，可以确定应选择表示“尽管”的though，故选B。
句意：许多国家都有母亲节，尽管它们并不总是在五月的第二个星期天。

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[单选题]Directions: In this part there is a sentence with four choices marked A, B, C and D. Choose the one that best completes the sentence.Many countries have a Mother's Day，（ ） they don't always fall on the second Sunday in May.