问题
选择题
26. With age, the mineral content of human bones decreases, ______ them more fragile.
A．make
B．to make
C．made
D．Making
答案
答案：D
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26. With age, the mineral content of human bones decreases, ______ them more fragile.
A．make
B．to make
C．made
D．Making
答案：D