选哪个?固定搭配吗?全句中文意思?Mr.Andrew teaches seminars on all of Polariod’s creative techniques and he is available to conduct workshops around the country ___ request.A.inB.uponC.at D.under1.选哪个?2.固定搭配吗?3.全句中

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选哪个?固定搭配吗?全句中文意思?Mr.Andrew teaches seminars on all of Polariod’s creative techniques and he is available to conduct workshops around the country ___ request.A.inB.uponC.at D.under1.选哪个?2.固定搭配吗?3.全句中
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选哪个?固定搭配吗?全句中文意思?Mr.Andrew teaches seminars on all of Polariod’s creative techniques and he is available to conduct workshops around the country ___ request.A.inB.uponC.at D.under1.选哪个?2.固定搭配吗?3.全句中
选哪个?固定搭配吗?全句中文意思?
Mr.Andrew teaches seminars on all of Polariod’s creative techniques and he is available to conduct workshops around the country ___ request.
A.in
B.upon
C.at
D.under
1.选哪个?
2.固定搭配吗?
3.全句中文意思?

选哪个?固定搭配吗?全句中文意思?Mr.Andrew teaches seminars on all of Polariod’s creative techniques and he is available to conduct workshops around the country ___ request.A.inB.uponC.at D.under1.选哪个?2.固定搭配吗?3.全句中
选B
upon/on +名词或 doing 是一种固定搭配,表示“一...的时候"
比如:upon receiving the letter,翻译为:一收到信件 upon request 就是”一有请求“或”如果有请求的时候”
所以整句话的意思就像我楼上的说的,安德鲁先生教授宝利来相机的所有相关技术,他可以随时根据需要联系国内各家工厂.