Watch out for these animals! They could be terrified ______ a sudden loud noise.
A．being thereB．should there be
C．there wasD．there have been
B

試題分析：句意：小心這些動(dòng)物！如果這里有一個(gè)突然的大的噪音，他們可能是非常害怕的。if引導(dǎo)虛擬語(yǔ)氣，如果句中有should，可以將其提前，并將if省略，there be 表示有，故選B
點(diǎn)評(píng)：if的虛擬語(yǔ)氣非常重要，簡(jiǎn)要概括如下：1、表示與現(xiàn) 在事實(shí)相反的情況，從句：If主語(yǔ)+過(guò)去時(shí)(Be動(dòng)詞用were)；主句：主語(yǔ)+should/would/could/might+do：　2、表示與過(guò)去事實(shí)相反的情況，從句：If主語(yǔ)+had+done；主句：主語(yǔ)+should/would/could/might+have done　3、表示對(duì)將來(lái)情況的主觀推測(cè)，從句：①if+主語(yǔ)+were to do②if+主語(yǔ)+should+do ③if+主語(yǔ)+did（動(dòng)詞過(guò)去式）/were ；主句：主語(yǔ)+should/would/could/might+do　
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