Computers and the advantage _________ gave us _________ being made better use of presently.
A．that;is　B．they;are?
C．it;was　D．which;were ?
B?
定語從句及主謂一致的運用。they代表computers,后者presently的出現(xiàn)表明是現(xiàn)在被更好的利用,且主語為復(fù)數(shù)。
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