1. The question is        the cost of the product (reduce)

問題是我們能否降低產(chǎn)品的成本。

1. whether we can reduce只可用whether,不可由if引導(dǎo)表語從句。

題目來源:高考英語組合訓(xùn)練多項(xiàng)選擇+完成句子 > 組合訓(xùn)練9-10

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