单项选择题
A．to be held B．held C．were held D．holding
Science is still （） of the causes of many kinds of canc...
单项选择题Science is still （） of the causes of many kinds of cancer.
A．ignorant B．unconscious C．conscious D．informed
I don't know his address, （）.A．otherwise I will write t...
单项选择题I don't know his address, （）.
A．otherwise I will write to him B．otherwise I would write to him C．otherwise I had written to him D．otherwise I would have written to him
