Question

It was playing computer games______ cost the boy plenty of time_____ he ought to have spent doing his homework.

1. A.
   that; that
2. B.
   which; that
3. C.
   which; when
4. D.
   that; when

Answer 1

A
考查强调句型和定语从句。考查强调句型。It is/was 被强调成分that/who其它成分；这是强调句型的基本结构。强调句型最大的特点就是把it is/was…that/who去掉，句子仍然成立。第一空强调playing computer games.第二空是定语从句，that指代先行词plenty of time作为spend的宾语。