题目内容
（请给出正确答案）
[主观题]
We'd better buy automation devices a month before the travel in order to ______.A．build an
We'd better buy automation devices a month before the travel in order to ______.
A．build an automatic system within the household
B．prove they can do the housework when we're absent
C．check whether they are the right ones we want
D．learn how to make them work properly now
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