Question

John failed in the driving test，________he had prepared a lot for it before.

A．as                                                   B．when

C．once                                                D．though

Answer 1

答案：　D

解析：　本題考查連詞的用法。句意為：盡管之前約翰為駕駛測試做了許多準備，但他還是沒有及格。as引導讓步狀語從句時，從句應部分倒裝，可排除A項；B、C兩項都不引導讓步狀語從句。