單項(xiàng)選擇題It is obvious that the expansion of the water （）the increase of its temperature.
A.is due to
B.dues to
C.is because
D.is for
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1.單項(xiàng)選擇題An engineer, together with some motormen （）to help in the repair work.
A.send
B.sends
C.was sent
D.were sent
2.單項(xiàng)選擇題If there are （） in the repair work, please come to our duty engineer at once.
A.any problem
B.some problem
C.any problems
D.some problems
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