15．There ________ a set of keys on the desk．Some boxes ________ on the desk，too．（　　）
A．is； areB．are； areC．is； isD．are； is

分析 桌子上有一串鑰匙，一些盒子也在桌子上．

解答 答案：A．考查there be句型．句意"桌子上有一串鑰匙，一些盒子也在桌子上．"．第一個空，there be句型，"有"的意思，be動詞單復數(shù)與臨近主語單復數(shù)一致．由a set of keys一串鑰匙，可知是單數(shù)，用be動詞單數(shù)is．B，D不正確．第二個空，主語boxes復數(shù)，因此用be動詞復數(shù)are，C不正確．答案是A．

點評 考查there be句型，there be 結構中的謂語動詞be在人稱和數(shù)上應與臨近主語一致．要結合語境選擇合適用法．注意時態(tài)，人稱等變化，及與have的區(qū)別．

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