How long is it_______they saw each other last time? ( )

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问题 How long is it_______they saw each other last time? (    )

选项 A、before
B、since
C、after
D、when

答案B

解析 ‘It’s+时间段+since+从句”句型中,since后面的从句用一般过去体。本句意为:距他们上一次见面有多长时间了?答案为B。
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