-What's up? You look worried.
Well,I_____on the problem for 5 hours but I haven't got a single clue.
A．have workedB．worked
C．will workD．have been working
D

試題分析：考查時態(tài)。從時間狀語 for 5 hours，可排除BC，然后根據(jù) but I haven't got a single clue，說明work這個動作還要持續(xù)下去，故用現(xiàn)在完成進行時。句意：——怎么啦？你看起來很焦急�！�，我花了5個小時在這個問題上但現(xiàn)在還沒有什么頭緒。
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