问题
单项选择题
The manager just ______ his resignation to the board meeting yesterday and today another one took his place.
A. sent up
B. sent off
C. sent out
D. sent in
答案
参考答案：D
解析： 本题的四个选项是由send为中心词构成的动词短语。A项的意思是“上升”，B项意为“邮寄；送别”，C项为“送货；发函”，D项为“呈送，提交”。根据句子的意思，D为正确答案。