Was it because of the heavy snowstorm in Europe the flight had to be put off?
#32608
A
which
B
so
C
why
D
that
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The reason _____ he refused to attend the meeting was that they didn’t give him an invitation earlier.
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A
how
B
which
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They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.
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A
what
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that
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which
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who
Mobile phone users have developed a series of symbols, such as and to show ________ they feel.
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which
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when
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As a green hand, he doesn’t know______ it takes to start a business here.
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when
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which