题目内容

-Jack hasn't taken his piano lessons for a long time.-He is considering _________ his piano course and spending more time on his study.

A. to drop
B. to throw
C. dropping
D. throwing

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I remember ______ to Beijing when I was a child.

A. to take
B. taking
C. to be taken
D. being taken

We only planned ______ the play for an hour, but in the end, we stayed for three hours.

A. watch
B. watches
C. to watch
D. watched

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A. 微量切削
B. 疲劳破坏
C. 压痕破坏
D. 断裂

磨料磨损的过程包括（）

A. 金属表面产生局部塑性变形
B. 折断
C. 表面被划伤
D. 磨粒嵌入金属表面，切割金属表面