单项选择题

We must know such symbols ______ are used to represent the chemical elements.

A．that
B．what
C．which
D．as
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单项选择题
The lecture ______, he left his seat so quietly that no one complained that his leaving disturbed the speaker.
A．began
B．beginning
C．having begun
D．being beginning
单项选择题
Emily Dickinson's garden was a place ______ great inspiration for her poems.
A．that she drew
B．by drawing her
C．from which she drew
D．drawn from which
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