单项选择题

When and where the new hospital will be built ______ a mystery.

[A] to remain
[B] remains
[C] remain
[D] is remaining
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Would you like a cup of coffee first, ______ shall we get down to business right now
[A] then
[B] when
[C] or
[D] otherwise
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It was the old man ______ has reported the fire.
[A] that
[B] which
[C] who
[D] since
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