—Who has taken my pen away?—__________. He was here a moment ago.  
#90019
A
It must be Li Ping
B
It is Li Ping take
C
Li Ping is
D
Li Ping must take
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These achievements_______ without the contribution of Qian Xuesen, a key leader of the New China's nuclear, missile and so on.
#89859
A
would have been unthinkable
B
would not be unthinkable
C
would be unthinkable
D
would not have been unthinkable
There is no light in the room.They ____asleep.
#90312
A
should have gone to
B
must be
C
could go
D
might be going