They have been in the library since_______.
A:a long time ago
B:it had been open
C:eight o'clock
D:two hours
应该选哪个?为什么?
人气：230 ℃ 时间：2019-12-10 03:45:38
解答
很高兴为您选Csince的用法：译作“自从…以来”(1)接时间点：如 I have stayed in that country since 1995.要求：谓v.用现在完成时,而且须是延续性动词.(2)接一段时间 + ago：如 They have lived in that house sin...
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