It is my_________ belief that an effective partnership approach between police and the public is absolutely necessary.
A. firmed
B. firming
C. firms
D. firm
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He broke his contract with the ________.
A. firms
B. firm
C. firming
D. firmed
His wife and children moved to______ him in their new home...
A. be joined
B. join
C. joining
D. will join
Make sure you___________ the queue inside the bank.
A. join
B. to join
C. be joined
D. joining
如果两个同维的向量组等价, 则这两个向量组()
A. 相等
B. 所含向量的个数相等
C. 不相等
D. 秩相等
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