Question

【題目】Various efforts ________ in the past decades to protect the environment.

A. had made B. have made

C. were made D. have been made

Answer 1

【答案】D

【解析】考查時態(tài)和語態(tài)。句意：在過去的幾十年里，為保護環(huán)境做出了各種努力。根據(jù)in the past decades可知句子用現(xiàn)在完成時態(tài)，efforts是句子主語，復(fù)數(shù)形式，和謂語動詞make之間是被動關(guān)系，所以此處用現(xiàn)在完成時態(tài)的被動語態(tài)，故答案為D。