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It used to be thought _____ the Earth was flat.

A. as                                                        B. when

C. since                                                    D. that

It used to be thought _____ the Earth was flat.

A. as                                                        B. when

C. since                                                    D. that

. It used to be thought _____ the Earth was flat.

A. as                 B. when           C. since             D. that

It used to be thought _____ the Earth was flat.

A. as       B. when

C. since   D. that

. It used to be thought _____ the Earth was flat.

A. as       B. when

C. since   D. that