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90. ____ the work was very difficult, they managed to finish it in time.

A. Because                B. Though              C. Therefore           D. But

90. ____ the work was very difficult, they managed to finish it in time.

A. Because                B. Though              C. Therefore           D. But

90. ____ the work was very difficult, they managed to finish it in time.

A. Because                B. Though              C. Therefore           D. But

90. ____ the work was very difficult, they managed to finish it in time.

A. Because                B. Though              C. Therefore           D. But

90. ____ the work was very difficult, they managed to finish it in time.

A. Because                B. Though              C. Therefore           D. But