问题

It was too hard for the firefighters to get close to the burning building. All their attempts to rescue the people trapped were ______.

A:in place
B:in return
C:in vain
D:in danger

正确答案是：

同类题型

You don’t know the way. Why ______ the policeman forhelp

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20. Don’t be too wordy. Just give me a very _____ answer.