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Thes chemical ,_______to kill biological organisms ,are unsafe and oten not specific in their targets .

A.
having designed
B.
to design
C.
designing
D.
designed

D
這題考查過去分詞的用法，be designed to do，“被設計做…”，design和chemical是被動的關系，句意是：被設計來殺死生物有機體的化學物質是不安全的，不能完全針對它們的目標。選D。

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Thes chemical ,_______to kill biological organisms ,are unsafe and oten not specific in their targets .