A.How do you do?
B.Thank you.
C.Sorry.
D. How are you.
第1题
The problem of housing ( ) leads to the problem of social instability.
A.itself
B.must
C.did
D.never
第2题
No sooner ( ) to bed than he heard a knock at the door.
A.had he gone
B.he had gone
C.did he go
D.he went
第4题
( ), the boy couldn ’t enter his house.
A.Since the key has lost
B.The key was lost
C.Lost the key
D.Having lost the key
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