He focused on his work all morning, only____
He focused on his work all morning, only____
sometimes to drink some tea.
A.stopping B.to have stopped
C.having stopped D.stopped
为什么,请详细解答,谢谢!
sometimes to drink some tea.
A.stopping B.to have stopped
C.having stopped D.stopped
为什么,请详细解答,谢谢!
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