It was until recently ____they worked out a solution to the problem.

A.didn’t；until

B.not；until

C.doesn’t；until

D.aren’t until

A.It is until

B.It was until

C.Not until

D.It was not until

A.Not until / the student suddenly found

B.Not until/did the student suddenly found

C.Until/the student suddenly found

D.Until/.did the student suddenly found

A.after

B. when

C. until

D. before

A.From

B. By

C. At

D. Until

______ I came to China ______ I knew what kind of country she is.

A．It is not until; when

B．It is until; that

C．It was not until; when

D．It was not until; that

A.It was not until ...then

B.It was not until ...that

C.It was until ...that

D.It was not until ...when

A.i=5Doi=i+1Loop Until i＜0

B.i=1Doi=i+2Loop Until i=10

C.i=10Doi=i+1Loop Until i ＞0

D.i=6Doi=i-2Loop Until i=1