The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.<br>A:screwing into<br>B:being screw on<br>C:to screw on<br>D:screwed into

The cylinder covers and the liners are bolted together by means of studs （） the cylinder frames.
A:screwing into
B:being screw on
C:to screw on
D:screwed into

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