问题补充:
单选题Tosucceedindoinganexperiment,________.A.carefulness is neededB.carefulness is one needsC.one needs to be carefulD.one need be careful
答案:
C解析主句没有主语,而D项时态不合。
时间:2020-11-06 02:13:31
单选题Tosucceedindoinganexperiment,________.A.carefulness is neededB.carefulness is one needsC.one needs to be carefulD.one need be careful
C解析主句没有主语,而D项时态不合。