单选题
The gap between those at the lowest level and those at the highest level of income had increased, and is continuing to increase.
A、
substantially
B、
successfully
C、
succinctly
D、
sufficiently
【正确答案】
A
【答案解析】
substantially根本地，充分地；successfully成功地；succinctly简洁地，简便地；sufficiently十分地。
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