单项选择题

（） does business with that fellow is bound to lose money.

A. Whoever
B. Who
C. No matter who
D. However

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单项选择题

Since his retirement, Peter Smith, who was （）a teacher, has written four novels.

A. lately
B. usually
C. formerly
D. already

单项选择题

Go and see what your mother is （） now.

A. for
B. at
C. about
D. busy

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