If only I _____to my parents' advice![ ]

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问题选择题

If only I _____ to my parents' advice![ ]

A. listening

B. listen

C. am listening

D. had listened

答案

答案：D

选择题

Amy ____ the school library. She ______ books three times a week.

A．has gone to; has used to borrow

B．has been to; used to borrow

C．has gone to; has been used to borrowing

D．has been to; is used to borrowing

单项选择题

103型、104型分配阀制动时，制动缸压力失调的原因是（）。

A.主活塞漏泄

B.作用活塞膜板穿孔

C.均衡部缩孔堵II被堵

D.作用阀脱胶