5．The number of microbloggers（微博）________from 63.11million by the end of 2010to 300million in 2012．（　�。�
A．have grownB．has grownC．are growingD．is growing

分析 微博用戶的數(shù)量已經(jīng)從2010年末的6311萬增長到了2012年的3億．

解答 答案：B
解析：根據(jù)句意"微博用戶的數(shù)量已經(jīng)從2010年末的6311萬增長到了2012年的3億"可知本題該使用現(xiàn)在完成時（表示過去發(fā)生的動作持續(xù)到現(xiàn)在所造成的影響或結(jié)果），故C、D選項直接排除；"the number of+可數(shù)名詞復(fù)數(shù)"作主語時其謂語動詞用單數(shù)形式，故A選項排除．綜上，本題答案為B選項．

點評 本題考查時態(tài)與語法，做此類題目時一定要根據(jù)句意確定句子所需時態(tài)，再從語法上分析對其他方面的要求，從而確定最終的答案．

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