30.It was his mother came in to prepare his lessons.
A.not until;did the boy
begin
B.until;that the boy began
C.until;did the boy
begin
D.not until;that the boy began
KEY:1-5 DBACD 6-10 CDCAB 11-15 BBDCB 16-20 DCCDC 21-25 DACDD 26-30 BCCB
状语从句专练答案:
1-5 C A B A D
6-10 C B C B D
11-15 A C D D D
16-20 D B C D C
21-25 C C D B B 26-30 A A C D D