13 —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.  will    D. can

13.   D考査情態(tài)動詞。句意："在網(wǎng)上搶到、張票不是容易的任務(wù)，因為網(wǎng)上每天有十億的點(diǎn)擊率。""我非常贊同你的觀點(diǎn)，每一步都可能會出錯。"這里用can表示客觀的可能性。所以選D。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練24 情態(tài)動詞和虛擬語氣

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