【题目】Follow these tips, and your time doing research on the Internet much more worthwhile.
A. being spent; will be B. spent; will be
C. spent; is D. having spent; has been
在线课程【答案】B
【解析】
考查过去分词和时态。句意：遵循这些建议，你花在网上做研究的时间会更有价值。第一空是过去分词作后置定语，填spent；结合句意可知句子用一般将来时态，填will be。故选B。