Question

The teacher asked the students______

A.if they were interested in dinusaurs

B.when was Albert Einstein born
C.what they will do with the computers
D.how many trees they have planted
问：为什么选A而不选D?

Answer 1

这句可以用排除法.
首先,时态是一般过去时引领的"asked"，所以后面用过去时，CD直接排除
然后用叙述语序，所以只能选A

Answer 2

正确：A
宾语从句时，主句为一般过去时时，从句通常套用过去时态的某种形式。如果D的have改为had，则也是正确的。

Answer 3

A 对
注
B语序错； C 与D 时态错；
D应该用过去完成时 how many trees they had planted

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