问题
The police were trying to _____ where the drug dealers were _____ it suddenly dawned upon themthat they might be hidden somewhere 10 miles within the border between the two countries. [ ]
A: come out; when
B: make out; while
C: figure out; when
D: think out; since
B: make out; while
C: figure out; when
D: think out; since
正确答案是：
