题目内容

A．sinceB．ifC．beforeD．as

A. since
B. if
C. before
D. as

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A．illogicalB．illegalC．improbableD．improper

A. illogical
B. illegal
C. improbable
D. improper

A．tighteningB．intensifyingC．focusingD．fastening

A. tightening
B. intensifying
C. focusing
D. fastening

A．ReleaseB．PublicationC．PrintingD．Exposure

A. Release
B. Publication
C. Printing
D. Exposure

【C20】

A. could
B. might
C. should
D. must