11. He did not study at all, but passed the test. The test couldn’t _____ very difficult.
(A) being
(B) have being
(C) have been
(D) been

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統計： A(22), B(24), C(257), D(59), E(0) #606350

Sharon

B1 · 2014/11/28

#946256

C. Speculations abou...

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Sharon

B2 · 2014/11/28

#946259

http://jessielinhuiching.wordpress.com/2012/03/20/%E6%83%85%E6%85%8B%E5%8B%95%E8%A9%9E%E7%9A%84%E9%81%8E%E5%8E%BB%E5%BC%8F-past-modals/