Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
It is rather inconvenient to have to switch from a regular phone ………. a smartphone at first.
A.on
B.until
C.up
D.to
It is rather inconvenient to have to switch from a regular phone ………. a smartphone at first.
A.on
B.until
C.up
D.to
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