The old lady’s hand shook frequently. She explained to her doctor ________ this shaking had begun half a year before, and ________, only because of this, she had been forced to give up her job. 
#73998
A
when; how
B
how; when
C
how; how
D
why; why
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We felt amazed at the use  the waste bottles.
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A
they had made
B
they had made of
C
they had put
D
they had put to
I borrowed several books from the library, ________ are about English study.
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A
two of them
B
and two of which
C
two of which
D
two of what