单项选择；___His return form Europe ,he set to work on the projectA AsB AtC UponD For
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单项选择；___HisreturnformEurope,hesettoworkontheprojectAAsBAtCUponDFor单项选择；___HisreturnformEurope,hesett
单项选择；___His return form Europe ,he set to work on the projectA AsB AtC UponD For
单项选择；___His return form Europe ,he set to work on the project
A As
B At
C Upon
D For
单项选择；___His return form Europe ,he set to work on the projectA AsB AtC UponD For
c ==as soon as he returned from -- - -- -.
___His return form Europe ,he set to work on the project
A As B At C Upon D For
选 C。
upon 相当于on
on one's return 在某人回来时
又如：
On his return he report his findings to the committee.
他一回来就向委员会报告调查结果。
选C，upon在此处的意思为一……就……具有同样效果的单词还有很多如：as soon as
等