Question

【题目】Mike does well in math, so _________ is easy for him to work out the difficult math problem.
A.this
B.that
C.it

Answer 1

【答案】C
【解析】句意：Mike数学学得好，因此对他来说，解决这道数学难题很容易。此处it作形式主语，真正的主语是to work out the difficult math problem。因此答案为C。