单项选择题

Sam bought a new cell phone （）he already had one

A. and
B. even though
C. if
D. when

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单项选择题

Jane was sitting on the sofa （）her legs

A. crossing
B. crossed
C. having crossed
D. she crossing

单项选择题

We're going to buy a house （）we save enough money

A. unless
B. since
C. when
D. until

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