—Hi, Susan, you look tired.—I ______ for months for the coming celebration for the school’s 60th anniversary.
#101623
A
was preparing
B
have been preparing
C
had prepared
D
prepare
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--- Oh, it’s you! I ___________ you.---- I have just had my hair cut, and I am wearing new glasses. 
#100135
A
didn’t recognize
B
don’t recognize
C
haven’t recognized
D
hadn’t recognized
----I’m sorry, but there is no smoking on this flight.----Oh, I _____ that. Sorry, I won’t again.
#104849
A
don’t know
B
didn’t know
C
won’t know
D
haven’t known
A lot of food as well as some tents _________to Yushu since the earthquake occurred.
#102740
A
has been transported
B
have been transported
C
is being transported
D
are transported