单选题 We find it extremely difficult to ______ the meaning of what he has just said.
A. get into B. get over C. get across D. get at

【正确答案】 D

【答案解析】get into意为“进入，陷入”：get over意为“克服，恢复”；get across意为“被理解，使人了解”，主要指论点被人理解；get at意为“理解，了解”。根据空格后面的meaning of what he has just said(他刚才讲的话的意思)可知，应该选用get at。