We know that he's from Austalia, but ______ is that he's a popular architect in Australia.
A. that we don't know
B. what we don't know
C. unknown
D. what unknown
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---- Where was it ________ the road accident happened yesterday?---- In front of the market.
A. when
B. that
C. which
D. how
It was the whole morning _______ the old man spent repairing the old clock at home.
A. during which
B. that
C. while
D. when
Only yesterday ______ I finish writing the thesis.
A. did
B. had
C. would
D. when
It was ________ the ambulance came ______ to the hospital.
A. until, that the boy was sent
B. until, did that boy get sent
C. not until, that the boy was sent
D. not until, did that boy get sent