The insect ______ a powerful drug which affects mosquitoes.
A．containsB．includesC．containedD．included
A
考查動(dòng)詞及時(shí)態(tài)。contain含有；include包括。根據(jù)語境可知用一般現(xiàn)在時(shí)態(tài)，故選A。
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