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at the airport, he telephoned his wife. [ ] A. Once arriving B. Upon arriving C.

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at the airport, he telephoned his wife. [ ] A. Once arriving B. Upon arriving C.

________ at the airport, he telephoned his wife.

[]A.

Once arriving

B.

Upon arriving

C.

As soon as reaching

D.

When getting

试题答案

答案:B

解析:

on/upon doing…意为“一……就……”。