问题
______ around the clock for two days，David managed to finish the report for the manager on schedule.
A:Working
B:Worked
C:Having worked
D:To work;
B:Worked
C:Having worked
D:To work;
正确答案是：
同类题型
What a mess！Tom，I have told you over and over again not to leave everything.
They are ______________ exciting that theycan jump up.
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“___________,” the soldiers screamed loudly, who held a gun in his hands, “or I will shoot again”