This meat tastes as if it ______ bad.
A. went
B. goes
C. has gone
D. will go
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When a pencil is partly in a glass of water, it is as if it ________ broken.
A. was
B. were
C. is
D. will be
Don't handle the vase as if it _______ made of steel.
A. were
B. was
C. has been
D. is
MOOC设计的流程有结构设计、资源准备、课程搭建、线上运行、反馈改进五个步骤。( )
A. 对
B. 错
翻转课堂教法设计的关键要把握什么原则?( )
A. 以教为中心
B. 以学为中心
C. 以内容为中心
D. 以问题为中心