The teacher asked the students ________.
A.if they were interested in dinosaurs
B.when was Albert Einstein born
C.what they will do with the puters
D.how many trees they have planted
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A解析此题考查宾语从句的时态和连词的选择和运用。此题主句的谓语用了一般过去时，宾语从句中的谓语要用过去时态，选项C和D被排除。宾语从句要用陈述句语序，B项是疑问句语序不对。