问题描述：
-Which lesson shall we __ -Let's turn to page 20 A. leave for B. beg...
-Which lesson shall we __ -Let's turn to page 20 A. leave for B. begin with
C. turn on
D. Pick up
-Which lesson shall we __ -Let's turn to page 20 A. leave for B. begin with
C. turn on
D. Pick up
问题解答：
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