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解析
| 共计 2 道试题

1 . Mike hasn’t appeared for two weeks, __________ his friends are wondering what has happened to him.

A.soB.butC.orD.for

2 . He will never make progress in math __________ he really wants to learn it.

A.ifB.as long asC.unlessD.in case
共计 平均难度:一般