He had lost track of his daughter for 24 hours — he was very concerned（ ）her safety.
A、
about
B、
in
C、
with
D、
into
【正确答案】：A
【题目解析】：
本题考查concern的介词搭配，be concerned about，关心，挂念。选A。句意：他已经失去女儿的踪迹24个小时了，他非常担心她的安全。
He had lost track of his daughter for 24 hours — he was very con
A、
B、
C、
D、
【正确答案】：A
【题目解析】：
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