12. You and I could hardly understand each other,
?
A. could I B. couldn't you C. could we D. couldn't we
13. We
the visitor with an apartment, but he specifically asked for a single room.
A. could provide B. could have provided
C. couldn't provide D. couldn't have provided
14. The missile is designed in such a way that once
nothing can be done to retrieve it.
A. fired B. being fired C. they fired D. having fired
15.
, he would not have recovered so quickly.
A. Hadn't he been taken good care of
B. Had he not been taken good care of
C. Had not he been taken good care of
D. Had he been not taken good care of