the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft Dthe question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D.whether it is safe

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the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft Dthe question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D.whether it is safe
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the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft Dthe question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D.whether it is safe
the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D
the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D.whether it is safe

the question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft Dthe question is --- to land on the grassland A.if it is safe B.if is it safe C.whether is it saft D.whether it is safe
选D
只有引导宾语从句时,IF和WHETHER是可以通用.
主语或表语从句只能由WHETHER引导,IF 不可以的.但IF还可以引导条件状语从句.

D

D
接让步状语从句
像这样:
The question is whether he can do it.
问题是他能不能做.