请帮我做一下"I'm deeply moved by ____they have done,"he said.A.when B.w_英语解答

请帮我做一下"I'm deeply moved by ____they have done,"he said.A.when B.what C.how D.while

人气：158 ℃　时间：2019-12-09 07:25:22

解答

by是介词,介词后面就要跟宾语,显然后面就缺一个宾语从句,其次,they have done是个主谓,缺宾语,能作宾语只能是what