问题
days after the aircraft went missing, an international effort ________ ships and planes hasn’t found any wreckage, ________ growing frustration for the families of the 239 people on board.
A:involved; causing
B:to involve; caused
C:involving; causing
D:involving; having caused;
B:to involve; caused
C:involving; causing
D:involving; having caused;
正确答案是：
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