1.(1)get through 捱过,通过
通过某地时,通常只能行走的路径很窄,仅容下通过之物
或能解释成通过考试的意思
(2)get through to sb 是某人理解
例如：
"It's been a challenge to get through to people that these are not shares in the new company ," GM said .
通用汽车表示,“迄今的挑战在于让人们明白,汽车清算公司的股票并非新通用汽车公司的股票.
(3)get through还有完成工作、测验合格、接通电话的意思
2.(1)get across 通过桥或森林
(2)get across 还有使被理解的意思
例如：
I couldn't get my point across in the debate.
在辩论中我无法清楚地表明自己的观点.
He found it difficult to get his idea across to them.
他发现他难以使他们了解他的想法
因此,这里选C