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4．The traveler is very tired，because he __________ in the desert in the sun for three hours．（　　）

	A．	will walk		B．	has been walking
	C．	walks		D．	is walking

分析那位旅行者很累，因為他在太陽下在沙漠里走了三小時．

解答答案：B 考查現在完成進行時．根據句中時間狀語for three hours可知，walk這個動作持續了三小時，還將可能持續下去，要用現在完成進行時．故選B．A項：一般將來時；C項：一般現在時；D項：現在進行時．

點評解答此類問題要了解各種時態的基本含義，并區別各種時態之間的差異，了解某些時態的特殊用法，然后結合語境選擇正確答案．

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