单项选择题

______ into use in April 2000, the hotline was meant for residents reporting water and heating supply breakdowns.
A.Put   B.Putting C.Having put   D.Being put

A.A.
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It was unbelievable that the fans waited outside the gym for three hours just _______ a look at the sports stars.A.had B.having C.to have D.have
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You should understand the traffic rule by now. Youve had it_______ often enough.A.explaining B.to explain C.explain D.explained
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