We collected a lot of books to get the necessary information but only half _________helpful, so we failed to finish the work.
A．is B．a(chǎn)reC．wasD．were
D
考查主謂一致.句意:我收集了許多書以獲得必要的信息,但是只有一半有幫助,因此我們未能按時完成工作.根據(jù)上下文可知謂語動詞用過去時態(tài),復數(shù)的一半還是復數(shù),故用are的過去時態(tài)were,選D.
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