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【单选题】
若f(t)=t^3+1,则f(t^3+1)= ( )

t^3+1
t^6+2
t^9+2
t^9+3t^6+3t^3+2
【单选题】
Take out accident( )before you travel.

insured
insurance
insurable
insurability
【单选题】
Please show your( ) card before entering.

identity
indentify
inendifying
identified
【单选题】
Dont forget ____ the window before leaving the room.

to have closed
to close
having closed
closing
【判断题】
Before the conjunctive adverbs there should be a semicolon, not a comma.

正确
错误
【单选题】
Please ______ you cigar before entering this building.

put down
put up
put off
put out
【单选题】
She ________ the door before she goes away.

had locked
is locking
has locked
was locking
【单选题】
_________hand in his exercise-book before Monday?

Need he to
Does he need
Needs he to
Need he
【单选题】
She ___ the door before she goes away.

had locked
is locking
has locked
was locking
【单选题】
He _______ working before 6 o’clock.

usually has finished
has usually finished
usually finished