Up to now, he _______ most of the works by Mark Twain.
A．is readingB．has readC．will readD．reads
B
考查時態(tài)。句意：直到現(xiàn)在他已經(jīng)讀了馬克吐溫的大多數(shù)作品。Up to now直到現(xiàn)在，現(xiàn)在完成時態(tài)的標(biāo)志，所以選B。
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