问题

The magician picked some persons from the audience _____ and asked them to help him with the performance

A:by accident
B:in vain
C:at random
D:on average

正确答案是：

同类题型

(2013·高考北京卷)________makes the book so extraordinary is the creative imagination of the writer.

You _________ to the party this evening, if you have something important to do.

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______ you always think about your future carefully and work hard, I’m sure you will realize your dream some day.

下列诗句，与“忽如一夜春风来，千树万树梨花开”所写景物季节相同的一项是(　　)