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

考查动词时态。根据for half a month为一段时间，动词得用延续性动词，应用现在完成时态。同时句意：她将两个月后回来。说明已经离开。A和B排除，C不能与时间段连用。