问题补充:
单选题Uptonow,doctors___abletodoverylittletotreatthisdisease.A.areB.will beC.have beenD.were
答案:
C解析考查时态,Up to now时间状语,用现在完成时,故选C
时间:2024-05-27 23:24:19
单选题Uptonow,doctors___abletodoverylittletotreatthisdisease.A.areB.will beC.have beenD.were
C解析考查时态,Up to now时间状语,用现在完成时,故选C