【单选题】Now that we have succeeded in isolating this drug, our next problem is to plan its in the laboratory.
【单选题】The next problem is, aluminium doesn't melt until ______ degrees.
【单选题】The problem is what we should do next.
A.
predicative clause 表语从句
C.
attributive clause 定语从句
【单选题】这份信用证中向银行提交的单据有几种( )