问题

It is uncertain____side effect the medicine will bring about，although about two thousand patients have taken it.

A:that
B:what
C:how D.whether;
D:whether;

正确答案是：

同类题型

1Now my father__________ his bike to work every day instead of driving.

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There are __________ oranges onthe table. the three

to drama currently on air, Man From the Stars, South Korean TV dramas have attracted wider audience.