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:if的虛擬語氣非常重要,簡要概括如下:1、表示與現(xiàn) 在事實(shí)相反的情況,從句:If主語+過去時(shí)(Be動(dòng)詞用were);主句:主語+should/would/could/might+do: 2、表示與過去事實(shí)相反的情況,從句:If主語+had+done;主句:主語+should/would/could/might+have done 3、表示對將來情況的主觀推測,從句:①if+主語+were to do②if+主語+should+do ③if+主語+did(動(dòng)詞過去式)/were ;主句:主語+should/would/could/might+do 
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