1．—I have got a headache.
—No wonder.You________in front of that computer too long.
A．work B．are working
C．have been working D．worked
答案 C [由I have got a headache可知用现在完成进行时态，表示 过去开始的动作对现在造成的影响或结果。]
2．Where have you been？We________you back much earlier.
A．were expecting B．are expecting
C．have expected D．expect
答案 A [句意：你去哪儿了？我们一直在盼着你早点回来。由句意可知，expect这个动作在你回来之前的时间里一直在进行着，所以用过去进行时态。]
