—— Nacy＿＿＿＿＿＿＿＿＿ the letter from her mother.
—— No, she can’t have. The postman hasn’t come yet.
A．can receiveB．can have received C．must have receivedD．must receive
C
“must have done”結(jié)構(gòu)，表示對過去發(fā)生情況的肯定推測。
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