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【单选题】
My mother asked you _______ when you come back. [ ]
A.
ring up her
B.
ring her up
C.
to ring up her
D.
to ring her up
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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】My mother asked you _________ when you come back. [ ]
A.
ring her up
B.
to ring her up
C.
to ring up her
【单选题】A solid disk and a ring roll down an incline. The ring is slower than the disk if
A.
m ring = m disk , where m is the inertial mass.
B.
r ring = r disk , where r is the radius.
C.
m ring = m disk and r ring = r disk .
D.
The ring is always slower regardless of the relative values of m and r .