It was 12 o'clock ______the plane took off.
A. when
B. that
C. since
D. till
It has been over a century _______ the railway was completed.(A)when(B) once(C) which(D) since
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One of his jokes, _______ I didn't really get it.(A)for(B) since(C) when(D) though
___________A] when[B] since[C] for[D] whereas
I worked _____12 last night. Of course, _____then I was really tired.A. till, afterB. at, tillC. till, by
You can go out,()you promise to be back before 12 o'clock.A. so far asB. as far asC. as long as
She usually goes home(at about 5 0'clock).(用when对括号部分提问)
Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.(A) since (C) after(B) before (D) when
