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【单选题】
Mary was not promoted because she dreamed too much and ______ in her lessons.
A.
fell out
B.
fell over
C.
fell through
D.
fell behind
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参考解析：
刷刷题刷刷变学霸
举一反三
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A.
Sinhalese
B.
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C.
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Veddas
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A.
one another
B.
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A.
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B.
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C.
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A.
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B.
a spare-time
C.
an untrained
D.
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A.
were chasing
B.
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D.
were on a chase
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A.
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D.
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A.
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B.
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C.
economical
D.
economic