有听力的:
abbcb,
bacab,
bbabc,
bbacc,
dbcab,
bacbb,
cdaca
dbcda,
acddb,
bacdb,
adccb,
dadcb,
ddcab,
cdbba,
ddacc.
短文改错
was-is,
presently-present,
of-to,
去掉第一个a,
will-would,
which-whose,
对,
study-learn,
getting后加on,
第一个as-that
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