Do you know the girl _____ wearing a red dress?
A. whose
B. who
C. whom
D. who's
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You may borrow any book _____.
A. that you interest
B. which you are interested
C. that interests you
D. which interests you
The reason _____ I'm writing to you is to tell you about a party on Saturday.
A. because
B. why
C. for
D. which
The film is set in the period _____ the divide between rich and poor was greater than it is now.
A. where
B. when
C. which
D. why
电阻元件的电压电流相位关系是()。
A. 相位相同
B. 电压超前电流90°
C. 电流超前电压90°
D. 不确定
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