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【简答题】
药物中砷盐的检查方法有哪些?分述其原理。
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【简答题】If the computer doesn’t work at the airport ,can the clerk work?
【单选题】The computer doesn’t work well, so something ______ wrong
A.
could have gone
B.
would go C should have gone D.must have gone
【单选题】Every possible means _______ to prevent the crash , but the computer doesn’t still work．
A.
is used
B.
are used
C.
has been used
D.
have been used
【单选题】The computer doesn’t work well, so something _________ wrong
A.
can have gone
B.
should have gone
C.
must have gone
D.
ought to have gone