They kept trying _____ they must have known it was hopeless.
A．ifB．because
C．whenD．where
C
考查連詞。if 如果，是否；because因?yàn)�；when既然，當(dāng)……時(shí)；where在哪兒。句意：考慮到他們一定知道這是沒(méi)有希望的，他們堅(jiān)持繼續(xù)嘗試。選C。
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