On returning from work, _____.
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A
John found a letter in the mailbox
B
a letter was found in the mailbox
C
a letter was in the mailbox
D
the mailbox had a letter in it
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（2014重庆一中高三下第三次月考）14. An EU official stressed that effective measures could be taken, the future for Europe was indeed dark.
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A
until
B
unless
C
since
D
while
If someone falls off the ladder and gets seriously hurt, you’d better leave him _____ he falls and try to get help.
#67860
A
before
B
when
C
where
D
what