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every three to five years, plants with new technology can make more powerful chips at lower costs, ______ plants with outdated equipment, which often cost billions of dollars to build, will be marginalized by the maker.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
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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