Question

The sun rises in the east and sets in the west,so it seems as if the sun___round the earth.

A was B were C had been D would be

Answer 1

应该选B were doing

太阳从东方升起,西边落下,因此看起来好象太阳围绕着地球转.

这里用得是虚拟语气,是对一般现在时的虚拟,所以be 动词变成were

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Answer 2

答案是were circling
as if引导的从句要求用虚拟语气，表示同时或将来的情况，动词要用过去式（be动词用were）或would(could等)+动词原形，本句话中指的是当时的情况，所以要用过去式，故were circling 是正确答案。

Answer 3

B
虚拟语气， 因为这不是事实， 此时be 动词一般用were

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Answer 4

从句要求用虚拟语气

Answer 5

B 虚拟语气