动车组转向架中轴箱定位装置限制了“ ” 与构架间的相对运动。
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The person I complained is the supervisor
A. whom
B. to whom
C. who
D. to who
I find it hard to imagine a time when ___ to solve
A. no problems will be there
B. there will be no problems
C. no problems there will be
D. there no problems will be
The reason ____ he rejected our plan is that he had no faith in us
A. which
B. that
C. why
D. because
Tom is the only one of the students who ____ to Shanghai
A. have gone
B. have been
C. has been
D. had gone
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