4．-Why ______ there doing nothing when you can lend me a hand，Michael？
-Sorry，Mom．（　�。�
A．to standB．standingC．standD．what

分析 ---Michael，你能幫我一把，為何站在那不動？
---抱歉，媽媽．

解答 答案：C
分析句子結構可知，"when you can lend me a hand，Michael"是when引導的時間狀語從句，所以"Why ______ there doing nothing"為主句．其中缺少謂語動詞，故用stand．

點評 考查謂語，考生需對句子結構進行分析，找出缺少成分，再判斷哪些形式可以做謂語．

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