【題目】The difficulty lies in ________ they will come to our help immediately.

A. whether B. that C. if D. which

【答案】A

【解析】

試題分析：句意：困難是他們是否能立刻來(lái)幫助我們。lie in后是賓語(yǔ)從句，介詞后的賓語(yǔ)從句表示是否的時(shí)候時(shí)，用whether不用if。故選A。

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