Navigators on ships and aircraft use a compass to determine _________ they are heading.
A. the direction in which
B. to where the direction
C. that direction of which
D. where the direction
它的解答是 A
但是說明卻寫 B才是正確的 到底哪一個才對咧 請各位幫幫忙啊~~
大感謝!!!!!