--- You didn’t hear me until now?
--- No. I must ___________ soundly(沉) when you came in.
| A．have slept | B．be sleeping | C．sleep | D．have been sleeping |
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--- You didn’t hear me until now?
--- No. I must ___________ soundly(沉) when you came in.
| A．have slept | B．be sleeping | C．sleep | D．have been sleeping |
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