From the weather map, the forecaster can advise pilots of the weather conditions they can expect to encounter _______ their flights.
A.when
B.while
C.since
D.during
正确答案是D
From the weather map, the forecaster can advise pilots of the weather conditions they can expect to encounter _______ their flights.
A.when
B.while
C.since
D.during
正确答案是D