Question

—It’s difficult to get to the other side of the river.
—I think a bridge        over the river

1. A.
   should be built
2. B.
   should build
3. C.
   will build
4. D.
   has built

Answer 1

A
句意：很難到河的另一邊�！�—我認(rèn)為應(yīng)該在河上建一座橋。結(jié)合語境可知下文從句描述是客觀性動作，故用一般現(xiàn)在時態(tài)。從句主語是動作對象，故從句中用被動語態(tài)。選A。
考點：考察時態(tài)及語態(tài)