Question

—I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.

1. A.
   could have prepared
2. B.
   shouldn’t have prepared
3. C.
   must have prepared
4. D.
   can’t have prepared

Answer 1

C
試題分析：考查情態(tài)動(dòng)詞+完成式的用法：A.could have done過去可能做了什么B. shouldn’t have done本不該做而做了， C. must have done一定已經(jīng)做了，D. can’t have done過去不可能做了，句意：--我以為他在演講前緊張，但是他很冷靜。--他一定準(zhǔn)備的很充分。選C.
考點(diǎn)：考查情態(tài)動(dòng)詞+完成式的用法
點(diǎn)評：情態(tài)動(dòng)詞+完成式要注意把握時(shí)間概念。情態(tài)動(dòng)詞無論是表達(dá)“推測和可能性”，還是表達(dá)“虛擬”這一概念，只要是對過去已經(jīng)發(fā)生的事情進(jìn)行描述，一律用“情態(tài)動(dòng)詞+have done”這一結(jié)構(gòu)；對現(xiàn)在或?qū)�來的事情進(jìn)行描述，用“情態(tài)動(dòng)詞+動(dòng)詞或系動(dòng)詞原形”。