问题
选择题
Don't bother Tom, he is________with the experiment on water molecules in the lab.
A．focused
B．fixed
C．occupied
D．concentrated
答案
答案：C
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Don't bother Tom, he is________with the experiment on water molecules in the lab.
A．focused
B．fixed
C．occupied
D．concentrated
答案：C
它的秩为2，