Question

The number of historic buildings which ________ has reached a surprising figure that we must be aware of.

A．has been pulled down	B．had been pulled down
C．is being pulled down	D．have been pulled down

Answer 1

D

選D　考查時(shí)態(tài)和主謂一致。句意：我們必須意識(shí)到，已被拆毀的歷史建筑的數(shù)量驚人。主語(yǔ)部分含有一個(gè)which引導(dǎo)的定語(yǔ)從句，先行詞是buildings，因此從句中的謂語(yǔ)應(yīng)該用復(fù)數(shù)形式。再根據(jù)句意可知，此處用現(xiàn)在完成時(shí)，表示“已經(jīng)被拆毀的”。