____ that silver is not widely used as a conductor?
A. Why is
B. Is it why
C. Why is it
D. Why is that
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---I can’t find Mr. Smith .Where did you meet him this morning?--- It was in the hotel ___ he stated.
A. that
B. which
C. the one
D. where
It was ___ it was raining so hard that we had to stay at home all day.
A. since
B. for
C. as
D. because
Is ____ three hours ____ the boy ___family is poor to come to school on foot?
A. it ;that; whose
B. it; that it takes; whose
C. it for ;that it takes; whose
D. it; when ;that
It was until dark ___ he found ___ he thought was the correct way to solve the problem.
A. that; what
B. that; that
C. when; what
D. when; that