The road was covered with sand ______ the heavy sandstorm.[ ]A. because of

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The road was covered with sand ______ the heavy sandstorm.[     ]
A. because of
B. because
C. for
D. as

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举一反三

Betty didn"t come to school yesterday ______ she was ill.[     ]
A. but
B. than
C. if
D. because

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Lucy knew nothing about it _____ her sister told her.       [     ]
A. because
B. until
C. if
D. since

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When I met him last week, it was the first time we had seen each other _____ we were at school.[ ]
A. for
B. from
C. since

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Yesterday morning ,Jim hurried to the station .He was very angry __ the train had just left.[ ]
A. and
B. so
C. because
D. so that

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I tied the tree to the top of the stick ___it was straight .[ ]
A. in order to
B. for
C. so that
D. but

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