American police wasted hours of their time_____to catch a large hot air balloon they had believed to have a child inside.(A) tried(B) trying?

2020-07-10 9:01 pm
(C)to try(D)were trying 
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回答 (1)

2020-07-11 12:12 am
Answer is (B) trying.  (participle construction with the verbs "waste" and "spend")

The pattern is:
verb + time/money expression + present participle
(wasted + hours of their time + trying)


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