Jessica ought to stop work.She has a headache because she _______ too long.
A．readB．is reading
C．had readD．has been reading
D
本題考查時態(tài)。從語境看，說明讀了很長時間，所以應用現(xiàn)在完成進行時，強調(diào)動作對現(xiàn)在造成的結果。
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