题目内容

(2014·山东省实验中学一模)You________get an all­expense­paid vacation to Australia if you can answer all the questions.
A．must　B．can
C．shall　D．may
C
考查情态动词。句意为：如果你能够回答所有问题，你就会得到一个去澳大利亚免费旅游的机会。shall用于第二、三人称时，表示警告、威胁、允诺、命令等，本句中表示允诺意味。故答案选C。must必须，一定；can能；may可能，均不符合语境，故排除。
答案：　C
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