______I was fifteen that I set my foot in Ireland.
A. It was not until
B. Not until
C. Although
D. Even if
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Not until quite recently______any idea what a spaceship was like.
A. did I have
B. that I had
C. when did I have
D. didn't I have
______opened the book when I heard steps outside the room.
A. I hardly
B. Hardly I had
C. Hardly had I
D. Hardly did I
Scarcely______to sleep when the telephone rang once more.
A. had I gone
B. I had gone
C. did I go
D. I went
It was not until 1969______the American astronaut succeeded in landing on the moon.
A. which
B. then
C. when
D. that