问两个单项选择1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C]

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问两个单项选择1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C]

问两个单项选择1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C]
问两个单项选择
1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying
2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C] were working [D] had worked
顺便说说原因,

问两个单项选择1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C]
B使某人做某事
D表示过去完成

B,BE MADE TO DONE
B,MET是过去式,所以接着要用过去完成时,ING表示过去一直一起工作

问两个单项选择1.Paul doesn't have to be made _________.He always works hard.[A] study [B] to study [C] studied [D] studying2.I first met Lisa three years ago when we _______ at a radio station together.[A] have worked [B] had been working [C] 两个单项选择 单项选择, 单项选择. 单项选择, 单项 选择 单项选择, 单项选择 单项选择 单项选择 单项选择 单项选择 单项选择, 单项选择, 单项选择, 单项选择 单项选择 单项选择