It _____ our dog which barked continuously all night, since it was sleeping inside with us. A) can't have been B) may not have been C) won't have been D) shouldn't be)
A) can't have been
You _____ not come early. I mean, you _____ start to work at 10 o’clock. A) need / should B) must / can C) need / may D) should / might
C) need / may
Why are you wasting time? You______ your work already. A) need to have finished B) could be finishing C) must be finishing D) should have finished
D) should have finished
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