[周报1期'T'33] Henry wanted to know _______to control the ship in the storm.A.that it is hard B.whether it was hard C.if it is hard D.when was it hard 为什么选B不选C?请详细分析.

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[周报1期'T'33] Henry wanted to know _______to control the ship in the storm.A.that it is hard B.whether it was hard C.if it is hard D.when was it hard 为什么选B不选C?请详细分析.
[周报1期'T'33] Henry wanted to know _______to control the ship in the storm.
A.that it is hard
B.whether it was hard
C.if it is hard
D.when was it hard
为什么选B不选C?请详细分析.

[周报1期'T'33] Henry wanted to know _______to control the ship in the storm.A.that it is hard B.whether it was hard C.if it is hard D.when was it hard 为什么选B不选C?请详细分析.
1.if/whether表示“是否”时,都可以引导该题中的宾语从句.
且该题的宾语从句中并没有Or之类的单词,所以if/whether都是可以使用的.
2.选B不选C的原因在于：宾语从句时态必须和主句时态一致.
此题主句为一般过去时（wanted）,所以其宾语从句也必须改成相应的过去时态.
而C错在is,表明从句是一般现在时.
B为was,表明从句是一般过去时.

从句作介词宾语只能用whether不用if

从句表示“是否”不能用if，if表示是否只能是连接词

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