问题
选择题
The insect ______ a powerful drug which affects mosquitoes.
A．contains
B．includes
C．contained
D．included
答案
答案：A
考查动词及时态。contain含有；include包括。根据语境可知用一般现在时态，故选A。
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The insect ______ a powerful drug which affects mosquitoes.
A．contains
B．includes
C．contained
D．included
答案：A
考查动词及时态。contain含有；include包括。根据语境可知用一般现在时态，故选A。