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The collapse of the World Trade Center has put US economy in a difficult .

A.occasion             B.case            C.situation             D.background

The collapse of the World Trade Center has put US economy in a difficult __________.

A.occasion             B.case            C.situation             D.background

The collapse of the World Trade Center has put US economy in a difficult ________.

A. occasion

B. case

C. situation

D. background

A. occasion

B. case

C. situation

D. background

The collapse of the World Trade Center has put US economy in a difficult______.

A. occasion　　　　　　　　  B. case　　　　　　　　　　　　 C. situation　　　　　　　　   D. background