6 颗豆豆
1. 单选题
15 秒
I couldn't find my cake; it ___ been my brother who took it !
must have
could have
couldn't have
may have
2. 单选题
15 秒
I'm not sure where my student card is. I ___ lost it.
must have
might have
couldn't have
3. 单选题
15 秒
I thought I saw Timothy in the toy shop, but it ____ been him; he's in class.
must have
could have
couldn't have
4. 单选题
双倍得分
20 秒
I ____ or ____ not have lost your phone in the sea...
must / must
may / may
could / couldn't
5. 单选题
15 秒
I ____ been crazy to fall in love with him !
must have
may have
couldn't have
6. 单选题
双倍得分
20 秒
That time, I____ agreed more with you.
must have
could have
couldn't have
may have
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