. It was _____ his mother came in _____
问题:
.
It was _____ his mother came in _____ to prepare his lessons.
A.not until; did the boy begin
B.until; that the boy didn’t begin
C.until; did the boy not begin
D.not until; that the boy began
.
It was _____ his mother came in _____ to prepare his lessons.
A.not until; did the boy begin
B.until; that the boy didn’t begin
C.until; did the boy not begin
D.not until; that the boy began