单项选择题
They lost their way in the forest, and ______ made matters worse was that night began to fall.
A. it
B. that
C. which
D. what
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单项选择题
As mainstream chip production technology shifts from one generation to the next every three to five years, plants with new technology can make more powerful chips at lower costs, ______ plants with outdated equipment, which often cost billions of dollars to build, will be marginalized by the maker.
A. because
B. even though
C. while
D. since
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单项选择题
He told us a lot of jokes and had us ______ all through the meal.
A. laughing
B. laugh
C. laughed
D. to laugh
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