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Engines are to machines _________ hearts are to animals. 

A. as          B. that        C. what        D. which

Engines are to machines _________ hearts are to animals. 

A. as               B. that                 C. what                D. which

Engines are to machines ____ hearts are to animals.

A. as   B. that    C. what   D. which

 Engines are to machines ____ hearts are to animals.

A. as   B. that    C. what   D. which

Engines are to machines ____ hearts are to animals.

A. as   B. that    C. what   D. which

Engines are to machines _____hearts are to animals.

A. as　　　　　　　　 B. that　　　　　　　　 C. what　　　　　　　　 D. which

Engines are to machines__________hearts are to animals.?

A.as 　　　　 B.that　　　 C.what　　　 D.which