—It's no easy task to catch a ticket on a website that receives 1 billion clicks daily.
—I can't agree with you more. There ________ be errors for every single step.
A．should B．must
C．can D．will
C
選C　考查情態(tài)動詞表示推測。句意：“在每天被點擊十億次的網(wǎng)站上搶到一張票不是容易的事�！薄拔曳浅Ｍ饽愕恼f法。每一步都有可能出錯�！眂an用于肯定句表示理論上的可能，即用來說明主語的特征。
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