问题补充:
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:
A. returns; finishes reading
B. will return; will finish to read
C. will return; finishes to read
(答案→)D. will return; finishes reading
解析: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