--- Each of the students, working hard at their lessons, ______ the book.
--- So have I.
A．is readingB．has readC．readingD．reads
B
由答語(yǔ)中的助動(dòng)詞have可確定此空應(yīng)用現(xiàn)在完成時(shí)態(tài)。
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