A manned mission (a) to Mars would allow a more (b) in depth study of the Red Planet , and many have argued that construction (c) a permanent base on Mars is much more (d) practical than build one on the Moon (d) Here, which two underlined sections need to be changed to correct the sentence?

Question

A manned mission (a) to Mars would allow a more (b) in depth study of the Red Planet , and many have argued that construction  (c) a permanent base on Mars is much more (d) practical than build one on the Moon (d) Here, which two underlined sections need to be changed to correct the sentence?

Accepted Answer

সঠিক উত্তর: b,d। ব্যাখ্যা: