HE DIDN’T PREPARE HIS LESSON SO HE COULDN’T ANSWER THE TEACHE...

22 . He didn’t prepare his lesson so he couldn’t answer the teacher’s

questions.

A.If he prepares his lesson he can answer the teacher’s questions.

B.If he prepared his lesson he could answer the teacher’s questions.

C.If he had prepared his lesson he could answer the teacher’s question.

D.If he had prepared his lesson he could have answered the teacher’s