—— I will come to attend your lecture at 10:00 tomorrow. —— I’m sorry, by then my lecture will have ended and I___my guests in my office. 
#104665
A
is being met
B
will meet
C
will be meeting
D
will have met
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-----What _____?-----I______my key and can't open the door. 
#104186
A
happened, lost
B
has happened, lost
C
happens, have lost
D
has happened, have lost
 The troops _______ themselves to go into battle.
#100152
A
prepared
B
were prepared
C
to prepare
D
preparing