Echo _____ for half a month. She’ll come hack in two months.

A. left   B leave   C. has left    D. has been away

D

解析:考查動詞時態(tài)。根據(jù)for half a month為一段時間，動詞得用延續(xù)性動詞，應用現(xiàn)在完成時態(tài)。同時句意：她將兩個月后回來。說明已經(jīng)離開。A和B排除，C不能與時間段連用。

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