单项选择题

______ are very bright.

A. Both of them
B. Both them
C. Both they
D. The both
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That won' t help things ______.
A. at all
B. for all
C. in all
D. of all
单项选择题
______ we used hand tools; later we had machines.
A. At the first
B. In the beginning
C. The first
D. At the beginning of
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