Question

Echo _____ for half a month. She’ll come hack in two months.
A. left   B leave  C. has left    D. has been away

Answer 1

D

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