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4．A set of keys on the desk．Some boxes on the desk，too．（　　）

A．

are，are

B．

is，are

C．

is，is

分析桌子上有一串鑰匙，一些盒子也在桌子上．

解答答案：B．考查系動詞．句意"桌子上有一串鑰匙，一些盒子也在桌子上．"．is單數，are復數．第一個空，a set of keys一串鑰匙，做主語，謂語動詞用單數，因此用is．第二個空，主語boxes復數．因此用are．答案是B．

點評考查系動詞，is是單數，are是復數，am通常與I連用，要結合語境，選擇合適用法，注意人稱及主語的單復數變化．

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