— Each of the students, working hard at their lessons, ______the book.  — So have I.
A．is readingB．has readC．readingD．reads
B
此題將主謂一致和時(shí)態(tài)結(jié)合在一起進(jìn)行考查。上一句的主語(yǔ)為each of the students 是單數(shù)，再結(jié)合下文的回答so have I，由此，可知上句應(yīng)該用完成時(shí)態(tài)。
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