Before a problem can be solved, it must be obvious ______ the problem itself is

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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

答案

举一反三

______ Barbara Jones offers to her fans is honesty and happiness.    [     ]
A. Which
B. What
C. That
D. Whom

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It was never clear ____  the man hadn"t reported the accident sooner.     [     ]
A. that
B. how
C. when
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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It has been proved _____ eating vegetables in childhood helps to protect you against serious illnesses in
latter life.     [     ]
A. if
B. because
C. when
D. that

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_____  was most important to her, she told me, was her family.       [     ]
A. It
B. This
C. What
D. As

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