踩下制动踏板后，踏板必须保持一定的高度，且高度要保持不变。（ ）
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Mr. Smith is one of the foreign experts ______ are working in China.
A. whose
B. in which
C. who
D. which
I’ll tell you _______ he told me last week.
A. all which
B. what all
C. that all
D. all
Wrestling is a sport _____ you try to get the other person down on the floor.
A. that
B. where
C. which
D. in which
Do you know the man _______?
A. to whom I spoke
B. to who I spoke
C. I speaking
D. that I spoke
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