问题

The police are________to conclude that thecause of fire had been a cigarette end

A:on which to base
B:which to base on
C:to baseon
D:to be based on

正确答案是：

同类题型

In our life, one question that ____ comes up is:“to be or not to be”

So far this year we _____ a fall in house prices by between 5 and 10 percent. [ ]

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I’m protecting myself mosquitoes

I’m new here. Could you tell me , please? [ ]