选D
这里虽然看句子是一个疑问句,但是它在整个句子中做的是从句,“树有多大”,当疑问句在一个句子中作从句时,它的顺序要是陈述句的句式,但疑问词还是要提前的.所以is就应该在a tree 的后面,这样才是陈述语句.所以应该是how old a tree is .
类似的还有I want to know how old she is ..
There are several tests you can apply to find out ( ).
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