______ the past year as an exchange student in Hong Kong, Linda is more independent now.

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looking to look look looked

exist expert express excuse

if(ex1)ex2；else ex3； if(ex2)ex1；else ex3； if(ex1)ex3；else ex2； if(ex3)ex2；else ex1；

if (ex1) ex2；else ex3； if (ex2) ex1；else ex3； if (ex2) ex3；else ex2； if (ex3) ex2；else ex1；

if(ex2) ex1； else ex3； if(ex3) ex2； else ex1； if(ex1) ex3； else ex2； if(ex1) ex2； else ex3；

is writing was writing wrote has written

That It This Such

exciting exchange example export

held increased expected offered

if(ex2)
ex1；
else
ex3；  if(ex3)
ex2；
else
ex1；  if(ex1)
ex3；
else
ex2；  if(ex1)
ex2；
else
ex3；

in on to by

explain example exercise exit

example exact explain exercise

is writing was writing wrote has written

if (ex1) ex2；else ex3；
if (ex2) ex1；else ex3；
if (ex2) ex3；else ex2； if (ex3) ex2；else ex1；

looking to look look looked

experience except exactly exhibition

精子： EX^B、 eX^b　　　卵细胞：EX^B、 eX^B、 EX^b 、eX^b 卵细胞：EX^B、 eX^b　　精子：EX^B、 eX^B 、EX^b、 eX^b

精子：EX、eX^B.、EX^b、eX^bB. 精子：EX^B.、eX^b 卵细胞：EX^B.、eX^B.、EX^b、eX^b 卵细胞：EX^B.、eX^b