问题
选择题
He the book to the library if he it tomorrow.
A．returns; finishes reading
B．will return; will finish to read
C．will return; finishes to read
D．will return; finishes reading
答案
答案：D
在if 引导的条件状语中，如果主句为一般将来时，从句用一般现在时代替将来时，故选答案为D