Question

Car rental agencies _______ a boom in business ever since new restrictions made it harder for people to buy an automobile in the capital.

A．has enjoyed

B．have been enjoying

C．a(chǎn)re enjoying

D．enjoyed

Answer 1

B

試題分析：考察時(shí)態(tài)。本題的關(guān)鍵在于后面的ever since（自從）引導(dǎo)的時(shí)間狀語從句，該時(shí)間狀語常常與現(xiàn)在完成時(shí)連用。句意：自從新的限制讓首都人民購買汽車變得更加困難，汽車租賃已經(jīng)有了很快的發(fā)展。該句的主語是復(fù)數(shù)形式，故B正確。
點(diǎn)評(píng)：現(xiàn)在完成進(jìn)行時(shí)表示從過去某個(gè)時(shí)間開始到現(xiàn)在一直都在發(fā)生，都在進(jìn)行的動(dòng)作。強(qiáng)調(diào)動(dòng)作的持續(xù)性。