When a pencil is partly in a glass of water it looks as if it .A. breaksB. has broken w.w

问题补充：

When a pencil is partly in a glass of water, it looks as if it .

A. breaks

B. has broken w.w.w.k.s.5.u.c.o.m

C. were broken

D. had been broken

答案：

A. breaks

B. has broken w.w.w.k.s.5.u.c.o.m

(答案→)C. were broken

D. had been broken

解析：as if 引导的句子，有时用虚拟语气，有时不用。原则上说，若指事实或可能为事实，不用虚拟语气；若指现在，从句谓语动词用一般过去时（be 用 were）；若指过去用过去完成时，若指将来用过去将来时或用 were to do sth.