63. The board deemed it urgent that these files right away.
A. had to be printed B. should have been printed
C. must be printed D. should be printed
64. It was essential that we lease before the end of the month.
A. sing B. singed C. had signed D. were signing
65. It is appropriate that some time ______thorough study of the results of the Apollo mission.
A. devotes to B. devoted to C. is devoted to D. be devoted to
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