They have no idea at all_______.
A. where he has gone
B. where did he go
C. which place he has gone
D. where he had gone
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Do you know ________ he expects will give us a talk.
A. who
B. whom
C. that
D. whose
用that/what填空：1. ______ hewants is a book.
I have no doubt ______ he will come.
下列哪个不是电子邮件服务的优点(B)
A. 方便迅捷
B. 时实性强
C. 费用低廉
D. 传输信息量大
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