单项选择题
Hardly had the engine started （） the temperature of the cooling water suddenly rose up to 40℃.
A.then
B.than
C.when
D.after
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A.stopping
B.being stopped
C.to stop
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The two-stroke cycle begins with the piston coming up from the BDC, with the scavenging ports in the sides of the cylinders being （）.
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单项选择题
Hearing a strong noise, （） at once.
A.the engine stopped
B.the engine was stopped
C.he stopped the engine
D.he had stopped the engine
