It was never clear ________ the man hadn"t reported the accident sooner.[ ]A

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It was never clear ________ the man hadn"t reported the accident sooner.[     ]
A. that
B. how
C. when
D. why

答案

举一反三

        really makes a difference is people"s attitude．[     ]
A．It
B．Which
C．What
D．That

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At the evening party the host said ________ was able to solve the riddle could get a nice present as a
reward.[     ]
A．whoever
B．who
C．no matter who
D．whomever

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Before a problem can be solved, it must be obvious ________ the problem itself is.[ ]
A. what
B. that
C. which
D. why

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It is uncertain ________ side effect the medicine will bring about, although about two thousand
patients have taken it.[ ]
A. that
B. what
C. how
D. whether

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— What made her so happy?
— ________ her son passed the driving test.
A. That
B. Because
C. Since
D. When

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