We ________ keep a cool head on over heating development, for it ________ have negative influence upon national economy．

1. A.
   should; must
2. B.
   must; would
3. C.
   might; could
4. D.
   must; may

 We ____ keep a cool head on over-heating development, for it ____ have negative influence upon national economy.

A. should; must      B. must; would      C. might; could         D. must; may

We ______ keep a cool head on over-heating development, for it _____ have negative influence upon national economy.

A．should; must          B．must; would       C．might; could        D．must; may

（2007合肥二次质检模拟）We ________ keep a cool head on over--heating development, for it ____ have negative influence upon national economy.

1. A.
   should; must
2. B.
   must; would
3. C.
   might; could
4. D.
   must; may