Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. A、 as B、 since C、 until D、 before

Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.

A、
as

B、
since

C、
until

D、
before

出自：华东交通大学大学英语1

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