单项选择题

(There) are (thousand) of (different) types (of) roses.

A．there
B．thousand
C．different
D．of
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单项选择题
There was nothing they could do ______
A. but to wait

B. only to wait
C. but wait

D. unless they waited
单项选择题
While discovering the cause of a serious illness,
A. the illness should be cured immediately
B. the patients should be taken good care of
C. the doctor should give the patient good care
D. the effective measure should be taken
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