17. Titanium has the strength of steel but weighs half only as much, hence its advantage
A B C
for use in aircraft. 答案是D, 可是C好象也有问题,half only 还是 only half 呢?
D
b --> only half
aircraft不可数名词,对的。
但是感觉hence后面的结构不完整。
D少了谓语 is
应该是 is in aircraft
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