问题
选择题
It is these poisonous products ________ can cause the symptoms of the flu, such as headache and aching muscles.
A．who
B．that
C．how
D．what
答案
答案：B
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It is these poisonous products ________ can cause the symptoms of the flu, such as headache and aching muscles.
A．who
B．that
C．how
D．what
答案：B