【題目】It hasn’t been made clear ______ the new underground line is to be open to traffic.

A．when B．that C．what D．where

【答案】A

【解析】此處it是形式主語(yǔ)，真正的主語(yǔ)是when引導(dǎo)的主語(yǔ)從句。句意：新的地鐵線路何時(shí)開(kāi)放還不清楚。將所有選項(xiàng)代入句中，只有when符合語(yǔ)境。

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