摘要:3.can/could+have+过去分词:常用于否定句和疑问句,could+have+过去分词除用于否定句及疑问句表推测外.还可用于虚拟语气.
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This car looks like mine , yet it isn''t . Whose ____ .
A . can B . could C . may D . must
查看习题详情和答案>>Put on more clothes. You _____ be feeling cold with only a shirt on.
A. can B. could C. would D. must
查看习题详情和答案>>Test takers _______ remain in their seats until all the exam papers have been collected.?
A. can B. could ?
C. shall D. would?
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