He looks tired,he _______ too little sleep.A must have had B must have C must have been

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He looks tired,he _______ too little sleep.A must have had B must have C must have been
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He looks tired,he _______ too little sleep.A must have had B must have C must have been
He looks tired,he _______ too little sleep.
A must have had
B must have
C must have been

He looks tired,he _______ too little sleep.A must have had B must have C must have been
A must have had
他看起来很累,他一定睡得太少了.A是表示推测的说法.
too little sleep 这种修释,显然可以看出sleep是名词.