Question

11. —Show me your permit, please.

―Oh, it's not in my pocket. It    .

A.    must have fallen out

B.    might fall out

C.    could fall out

D.    should have fallen out

Answer 1

11.   A 考查"情態(tài)動(dòng)詞+ have done"結(jié)構(gòu)。must have done表示對(duì)過去發(fā)生的事情進(jìn)行有把握的推測(cè)，意為"一定做過"， must have fallen out表示fall out這個(gè)動(dòng)作在說話之前已經(jīng)發(fā)生了。由此可知表示推測(cè)，排除D;表示動(dòng)作過去巳發(fā)生， 排除B、C。句意："請(qǐng)出示您的許可證。""哦，它不在我的口袋里，一定是掉了。"

【拓展延伸】"情態(tài)動(dòng)詞+ have done"—定是與過去相關(guān)，有

兩種含義.

CD對(duì)過去情況的猜測(cè)，如：

must have done(肯定做過了 )

can't have done(不可'能做過 )

may/might/could have done(可能做過了)

(2)與過去事實(shí)相反，如：

should (not) have done(本該/本不該做)

needn't have done(本不必做  )

might/could have done(本可以/本能夠做 ）