He always helps us ________ he is doing when we turn to him for help.
A．wheneverB．whateverC．whicheverD．however
B
四個選項(xiàng)分別表示無論什么時候、無論什么、無論哪一個和無論怎樣，根據(jù)題意這里的引導(dǎo)詞為do的邏輯賓語，故選B，當(dāng)我們向他尋求幫助時，無論他正在做什么，他總是幫助我們。
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