Liu Xiang’s breaking the world record was an exciting moment, ________all of us will never forget.

A.that B.one C.it   D.what

Dr. Frank failed many times but he finally to find a successful way to solve the problem.A.broke off B.broke up C.broke down D.broke through

A.B.broke

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—Were the audience allowed to joinin the play? —Yes, the actors style='text-indent: 14px;'> style='text-indent: 14px; '> to satisfy the audience were successful.A.who it was the duty B.of which the duty wasC.whose duty it was D.whose was the duty